Category: Plants

  • How to stake tall perennials discreetly

    How to stake tall perennials discreetly

    Plant supports work best when you hardly notice them. Tall perennials can collapse after wind and rain, but heavy staking added after stems have already fallen often leaves a border looking tied together rather than naturally supported.

    The most effective technique is usually to provide support early, while stems are still growing through and around it.

    Which plants need support?

    Not every tall perennial needs staking. Plants growing in rich soil or partial shade may become taller and softer than the same variety in leaner, sunnier conditions.

    Repeatedly collapsing plants, large heavy flower heads and exposed positions are useful signs that support may help.

    Support early

    Install supports while plants are still relatively short. As the stems grow, foliage hides the structure and the support becomes integrated into the plant.

    Waiting until flowering stems have fallen usually requires taller stakes and visible ties.

    Use twiggy branches for informal support

    Branched prunings pushed into the soil around an emerging clump create a natural network through which stems can grow.

    This traditional method is particularly effective in informal planting because the support almost disappears once foliage develops.

    Metal grow-through supports

    Grid or ring supports positioned over a young plant allow stems to emerge through separate openings. They are useful for large clump-forming perennials and plants with multiple flowering stems.

    Choose a support that will finish below the mature flower heads so the plant remains visually dominant.

    Individual stakes

    A single tall stem may need its own stake. Position the stake close enough to support the stem without driving it directly through the main crown or root system.

    Tie the stem loosely enough to allow some natural movement and thickening.

    Use soft ties

    Wire and very thin string can cut into growing stems. Use soft garden twine or flexible ties that spread pressure over a wider area.

    Check ties later in the season because stems may expand considerably.

    Do not pull every stem into a tight bundle

    A common mistake is to tie a wide clump tightly to one central stake. This changes the natural shape of the plant and creates an obvious narrow waist.

    Several discreet supports around the clump usually produce a more natural outline.

    Consider neighbouring plants

    Dense surrounding planting can provide a degree of natural support. Strong neighbouring perennials and shrubs break the wind and help stems remain upright.

    This is one reason layered planting often needs less obvious staking than isolated specimen plants.

    Reduce the need for staking

    Plants become more prone to collapse when grown in excessive shade or very rich conditions. If a perennial repeatedly becomes taller than expected, check whether its position suits it.

    A plant that needs a complex framework every year may simply be in the wrong place.

    The Chelsea chop

    Some late-flowering perennials can be cut back partially in late spring to produce shorter, bushier growth and later flowers. This technique is often known as the Chelsea chop.

    It is not suitable for every perennial. Check the response of the particular plant before cutting valuable growth.

    Remove supports at the end of the season

    Once plants are cut down or have collapsed naturally, collect reusable supports, clean them where necessary and store them dry.

    Leaving metal grids hidden in bare borders can create a trip hazard during winter work.

    Good staking preserves the plant’s character

    The aim is not to make every stem perfectly vertical. A good support prevents destructive collapse while allowing enough movement for the plant to retain its natural form.

    For border structure, read Planting a garden for the seasons. For summer tools, see A few useful tools for summer gardening.

  • How to divide established perennials

    How to divide established perennials

    Dividing established perennials is one of the most useful ways to renew a border without starting again. A mature clump can often be lifted and separated into several vigorous pieces, giving you new plants while improving the performance of the original one.

    Division is particularly valuable when a perennial has become congested, developed a bare centre, produced fewer flowers or simply grown beyond the space intended for it.

    When should perennials be divided?

    For many garden perennials, the best periods are spring as active growth begins or early autumn while soil is still warm enough for roots to establish. Avoid dividing during severe heat, frozen conditions or when soil is saturated.

    A useful principle is to give the divided plant time to make roots before it has to cope with either summer drought or winter extremes.

    Not every perennial wants the same treatment

    Many clump-forming perennials divide readily, but plants with deep taproots, woody crowns or very specific root structures may respond poorly. If you are unsure, check the propagation method recommended for the particular plant before lifting a valuable specimen.

    Prepare the new planting area first

    Do not leave freshly divided plants lying in the sun while you decide where they should go. Prepare the destination before lifting the parent clump. Remove perennial weeds, loosen compacted soil and make sure the area drains reasonably well.

    Where the soil needs improvement, incorporate suitable organic matter into the wider planting area rather than creating a small pocket of completely different material around the roots.

    1. Cut back excessive top growth if necessary

    Large leafy plants are easier to handle when some top growth is removed, particularly in autumn. Do not cut everything automatically: the amount depends on the plant and the season. The goal is simply to reduce damage and moisture loss while you work.

    2. Lift a generous root ball

    Work around the clump with a fork or spade, beginning far enough from the crown to avoid cutting through the most useful roots. Loosen the plant from several sides before levering it from the ground.

    For valuable or brittle plants, two garden forks inserted back-to-back can sometimes separate a clump more gently than chopping through it immediately with a spade.

    3. Separate the healthiest sections

    Once lifted, examine the crown. Look for vigorous outer portions with healthy shoots and roots. Old, exhausted or dead material from the centre can usually be discarded.

    Loose-rooted plants may pull apart by hand. Dense crowns may need two forks, a sharp spade or a clean knife. Each new piece needs enough viable root and growing points to re-establish.

    Do not make divisions unnecessarily small

    It is tempting to turn one plant into as many pieces as possible. Very small divisions, however, take longer to recover and may be more vulnerable to drought or competition. Fewer substantial pieces usually establish faster and make a stronger visual impact in the border.

    4. Replant promptly

    Plant divisions at approximately the depth at which they were growing before. Spread roots naturally rather than forcing them into a narrow hole. Firm the soil gently so there are no large air pockets, then water thoroughly.

    If you are replanting part of the original clump in the same position, refresh the surrounding soil and remove exhausted or damaged material before returning the healthy division.

    5. Water during establishment

    Even drought-tolerant mature plants need reliable moisture while rebuilding a root system. Keep an eye on newly divided perennials through dry periods. The aim is consistently adequate moisture, not permanently saturated soil.

    Mulch, but leave the crown clear

    A layer of organic mulch around newly planted divisions can help moderate soil moisture and reduce weed competition. Avoid burying crowns that naturally sit at or near the soil surface.

    Signs that a perennial may need dividing

    • The centre of the clump is dying out while the edges remain vigorous.
    • Flowering has become noticeably weaker.
    • The plant has outgrown its allotted space.
    • Neighbouring plants are being crowded.
    • You want to repeat a successful plant elsewhere in the garden.

    Division is also a design tool

    Repeating a reliable perennial in several places can make a border feel more coherent. Division therefore does more than propagate plants: it lets you edit the planting, strengthen rhythm and redistribute plants towards the conditions where they perform best.

    Before replanting, it is worth revisiting Choosing plants for a sunny border and Planting a garden for the seasons.

  • How to take softwood cuttings

    How to take softwood cuttings

    Softwood cuttings are a straightforward way to make new plants from fresh young growth. Instead of waiting for seed, you take a short piece of healthy stem from an established plant and encourage it to make its own roots. When successful, the new plant is genetically identical to the parent.

    Late spring and early summer are particularly useful because many plants are producing vigorous new shoots that are mature enough to handle but have not yet become woody.

    What is a softwood cutting?

    Softwood is the fresh, flexible growth produced during the current season. It bends easily and is usually greener and less rigid than older stems. This young material can root quickly, but it also loses moisture rapidly after being removed from the parent plant. That is why careful handling matters.

    Choose the parent plant carefully

    Take material from a healthy, vigorous plant that is not obviously stressed by drought, pests or disease. Choose shoots that are typical of the plant rather than unusually weak or distorted growth.

    Morning can be a good time to collect cuttings because stems are generally well hydrated. If you cannot prepare them immediately, keep them cool and prevent them from drying out.

    What you need

    • Clean, sharp secateurs or a propagation knife
    • Small pots or modules with drainage
    • Fresh peat-free propagation or multipurpose compost
    • A pencil, dibber or similar tool for making planting holes
    • A clear cover or propagator where appropriate
    • Labels

    1. Take more material than you finally need

    Cut healthy non-flowering shoots a little longer than the finished cutting. This allows you to make the final cut neatly once you are working at the potting bench.

    If a shoot has begun forming flowers, choose another where possible. Root formation is the priority and a strongly flowering shoot is directing energy elsewhere.

    2. Prepare the cutting

    Trim the base with a clean cut just below a leaf joint or node where appropriate for the plant. Remove the lower leaves so that no foliage will be buried in the compost. Retain enough upper foliage for photosynthesis without leaving such a large leaf area that the cutting loses water excessively.

    Large leaves can sometimes be reduced, but avoid unnecessary cutting unless it genuinely helps manage moisture loss.

    3. Insert into moist compost

    Fill a pot with moist compost and make planting holes around the edge with a dibber. Insert each cutting carefully so the prepared lower stem is in contact with the compost. Firm lightly around it.

    Several cuttings can share a pot as long as their leaves are not tightly crowded together. Good airflow becomes increasingly important as they begin to grow.

    4. Reduce water loss without creating stagnant conditions

    A clear propagator lid or loose cover helps maintain humidity around cuttings that wilt easily. Keep the cover away from the foliage where possible and provide some ventilation. Constant condensation and stagnant air can encourage rotting.

    Place the pot in bright indirect light. Strong direct sun can overheat a covered pot and dehydrate cuttings surprisingly quickly.

    5. Keep the compost moist, not saturated

    The cutting has no established root system, so drying out is dangerous. At the same time, waterlogged compost reduces air around the base and can encourage decay. Check regularly rather than watering automatically on a fixed schedule.

    How do you know a cutting has rooted?

    Fresh new growth is encouraging, although it is not absolute proof. A very gentle resistance when the cutting is touched can indicate that roots have begun anchoring it. Do not repeatedly pull cuttings from the compost to check progress; that can damage the new roots you are trying to establish.

    Potting rooted cuttings on

    Once a cutting has formed a useful root system, move it into its own small pot with suitable compost. Water after potting and keep it sheltered while it adjusts. Gradually introduce stronger light and outdoor conditions rather than moving a protected cutting directly into an exposed border.

    Why softwood cuttings fail

    • The material dried out between cutting and preparation.
    • Stems were too soft, weak or already stressed.
    • The compost stayed saturated.
    • Covered pots overheated in direct sunlight.
    • Dirty tools or old compost introduced disease.
    • The chosen plant is better propagated by another method.

    Propagation becomes easier with repetition

    Take several cuttings rather than relying on one. Even experienced gardeners expect some losses, and a small batch makes it easier to see which material roots most reliably. Label the pot with the plant and date, and make a note of the results. That turns a simple technique into useful knowledge for future seasons.

    For growing media and establishment, see Peat-free compost in the garden.

  • How to plant bare-root roses and shrubs

    How to plant bare-root roses and shrubs

    Bare-root plants arrive without a pot and with little or no compost around their roots. They may look less impressive than container-grown plants at first glance, but during the dormant season they can be an efficient, economical way to establish roses, hedging plants, shrubs and trees.

    The important part is hidden below ground: healthy roots, careful planting and good contact with the surrounding soil. If those are right, a bare-root plant can establish quickly once growth resumes.

    When to plant bare-root material

    Bare-root plants are generally supplied while dormant, from autumn into winter and early spring. Plant when the soil is workable: not frozen, not waterlogged and not so dry that roots cannot establish properly.

    Autumn planting often gives roots time to begin settling before spring growth. In colder or very wet gardens, later winter or early spring planting can sometimes be more practical.

    Do not let the roots dry out

    Bare roots have no pot of compost protecting them. Unpack the plant promptly and keep the roots cool and moist. If planting is delayed briefly, follow the nursery’s storage instructions rather than leaving the roots exposed to air, sun or wind.

    Before planting, inspect the root system. Trim only roots that are genuinely damaged or broken, using clean sharp tools. Healthy roots should be preserved.

    Prepare the whole planting area

    Remove perennial weeds and loosen compacted soil around the intended planting position. A planting hole should be comfortably wide enough for the roots to spread naturally without being folded sharply back on themselves.

    Digging an extremely deep hole and filling it with rich material is usually unnecessary. The plant eventually needs to grow into the surrounding garden soil, so improving the wider area is more useful than creating an isolated pocket.

    1. Check the planting depth

    Look for the previous soil mark on the stem where possible. Most shrubs should be replanted at approximately the depth they were growing before. Planting too deeply can reduce oxygen around the root system and bury stems that are not adapted to underground conditions.

    With grafted roses, recommendations for the graft union can vary according to rose type, climate and nursery guidance. Follow the supplier’s instructions rather than applying one rule to every rose. Around soil level, or slightly below where specifically recommended, is common practice.

    2. Spread the roots naturally

    Hold the plant upright in the hole and arrange the roots so they radiate into the soil rather than circling or turning sharply upwards. Enlarge the hole if necessary. Cutting healthy roots simply to fit a hole is the wrong way round.

    3. Backfill carefully

    Return soil around and between the roots, gently shaking or adjusting the plant where useful so large air pockets do not remain. Firm progressively with your hands or light foot pressure. The aim is good soil-to-root contact without compacting wet soil into a hard mass.

    4. Water after planting

    Watering settles soil around the roots and ensures the planting zone begins evenly moist. Do this even during the dormant season when conditions are relatively dry.

    Continue monitoring moisture during the first growing season. A plant that has begun producing leaves is losing water even if its new root system is still limited.

    5. Mulch the root zone

    A layer of suitable organic mulch can reduce evaporation, suppress competing weeds and gradually improve the surface soil. Keep mulch away from direct contact with stems and the crown.

    Should you add fertiliser?

    More feeding is not automatically better at planting time. Good soil preparation and moisture management are usually more important during initial establishment. Where fertiliser is appropriate, follow the requirements of the plant and product rather than adding a strong feed directly against bare roots.

    The first growing season

    Newly planted roses and shrubs should be checked regularly during dry spells. Deep, occasional watering that moistens the root zone is generally more useful than frequent superficial sprinkling.

    Keep weeds and vigorous neighbouring plants from competing immediately around the new plant. Do not be alarmed if top growth initially seems modest: establishment below ground is the priority.

    Common planting mistakes

    • Allowing roots to dry out before planting.
    • Forcing roots into a hole that is too narrow.
    • Planting significantly deeper than the original soil line without a specific reason.
    • Working waterlogged soil and destroying its structure.
    • Assuming winter rain means a newly planted root zone can never become dry.
    • Leaving grass or weeds to compete directly around the plant.

    Choose for the site before you plant

    Good planting technique cannot compensate indefinitely for the wrong plant in the wrong conditions. Light, soil moisture, mature size and exposure should all be considered before ordering. Bare-root planting works best when it is the final step in a good decision rather than an attempt to rescue a poor one.

    See also Choosing plants for a sunny border and Planting a garden for the seasons.

  • Black spot on roses: what actually helps

    Black spot on roses: what actually helps

    Black spot is one of the most common diseases of garden roses. Dark spots develop on leaves, often surrounded by yellowing tissue, and badly affected plants can lose a large proportion of their foliage during summer.

    The aim of management is not necessarily to produce a rose with no marked leaf at all. It is to reduce repeated heavy infection so the plant keeps enough healthy foliage to grow and flower well.

    Recognising black spot

    Typical symptoms are irregular dark purple-black spots on leaves. The surrounding leaf tissue often turns yellow, and leaves may fall prematurely.

    Symptoms often begin on lower foliage and become more obvious as the season progresses.

    Why some roses suffer more than others

    Rose varieties differ greatly in their resistance. Some remain relatively clean in ordinary garden conditions while others become heavily affected every year.

    Growing conditions matter too. Dense planting, a sheltered humid position and stressed plants can all make disease management more difficult.

    1. Remove badly affected leaves

    Where practical, remove heavily infected leaves from the plant. Do not remove so much foliage that an already weak rose is left almost bare purely for cosmetic reasons.

    2. Clear fallen rose leaves

    Infected fallen leaves can contribute to disease carrying over around the plant. Collecting heavily affected rose foliage from beneath the plant is a sensible part of seasonal hygiene.

    This is particularly useful in autumn when a large amount of leaf material accumulates under established roses.

    3. Improve the structure of the rose

    Congested plants remain damp for longer and are harder to inspect. Appropriate pruning can open the framework and improve airflow through the plant.

    Pruning technique depends on rose type, so do not simply remove random stems during the growing season.

    4. Water at soil level

    During dry periods, water the root zone deeply rather than repeatedly wetting the foliage. Splashing water can help move fungal spores between leaves, and wet foliage can remain damp for longer in poorly ventilated positions.

    Good soil moisture also helps the rose maintain stronger growth and replace lost foliage.

    5. Mulch around the rose

    A suitable organic mulch can help moderate soil moisture and reduce the amount of soil splash reaching lower leaves.

    Keep mulch away from direct contact with stems and the crown.

    Avoid overfeeding

    A rose repeatedly pushed into very soft growth is not necessarily a healthier rose. Feed according to the needs of the plant and avoid assuming that strong fertiliser applications will compensate for disease.

    Choose resistant roses for new planting

    Variety selection is one of the most effective long-term tools. If you are planting new roses, consider disease resistance alongside flower colour, fragrance and mature size.

    A rose that remains healthy with modest care is usually more rewarding than one that needs repeated treatment to retain its leaves.

    Do fungicides solve black spot?

    Fungicides may be available for black spot in some regions, but they are not a substitute for good plant choice and growing conditions. Products and legal approvals change over time.

    If a fungicide is used, choose only one currently authorised for roses and black spot in your location and follow the label exactly.

    Should a badly affected rose be replaced?

    If the same rose loses most of its leaves every year despite appropriate care, replacement can be reasonable. Modern disease-resistant varieties can provide a similar garden effect with much less intervention.

    Manage the whole plant

    Black spot management works best when several small measures are combined: good variety choice, sensible pruning, reliable soil moisture, hygiene and appropriate spacing. No single action is likely to keep a highly susceptible rose completely clear in a bad disease year.

    For watering advice, see Watering the garden in dry weather. For plant selection, read Choosing plants for a sunny border.

  • Why are my plant leaves turning yellow?

    Why are my plant leaves turning yellow?

    Yellow leaves are a symptom, not a diagnosis. Plants lose their green colour for many reasons, from completely normal ageing to root damage, drought, waterlogging, nutrient problems or disease.

    The fastest way to make a wrong diagnosis is to see a yellow leaf and immediately add fertiliser. Instead, look at where the yellowing occurs, how quickly it developed and what changed around the plant recently.

    First ask: which leaves are yellow?

    Older lower leaves yellowing slowly can be part of normal leaf ageing, particularly as a plant redirects resources into new growth or towards the end of its season.

    Yellowing on the newest leaves, by contrast, may suggest a different problem involving nutrient availability, root conditions or active growth.

    Look at the pattern

    Uniform yellowing across the whole leaf suggests something different from green veins surrounded by pale tissue, scorched leaf edges or irregular yellow patches.

    Take a moment to compare several leaves rather than focusing on one damaged example.

    Check soil moisture before anything else

    Both drought and waterlogging can cause leaves to yellow because roots are unable to supply the plant normally.

    Push a finger into container compost or inspect the soil around garden plants. Do not judge moisture only by looking at the surface.

    Yellow leaves and overwatering

    Roots need oxygen as well as water. Constantly saturated compost can suffocate roots and encourage decay. The plant may wilt even though the compost is wet because damaged roots can no longer move water effectively.

    In pots, check that drainage holes are open and that the container is not standing permanently in water.

    Yellow leaves and drought

    A plant repeatedly allowed to dry severely may shed older leaves to reduce water loss. Containers are especially vulnerable because a limited compost volume can dry rapidly in sun or wind.

    Water deeply enough to moisten the root zone rather than giving frequent tiny amounts.

    Could the plant be hungry?

    Nutrient shortage is possible, particularly in containers where nutrients are gradually washed out or used by the plant. But deficiency should not be assumed before checking moisture and roots.

    Feed according to the plant, season and growing medium. Too much fertiliser can damage roots and create a new problem.

    Soil pH can affect nutrient availability

    Some plants struggle to absorb particular nutrients when grown in soil with an unsuitable pH, even if those nutrients are technically present.

    Acid-loving plants grown in strongly alkaline conditions are a common example. In a persistent unexplained case, a soil test can be more useful than guessing.

    Check the roots

    A root-bound container plant may have used most of the available compost and water very quickly. Lift the root ball where practical and see whether roots are circling densely around the pot.

    Also look for dark, soft or foul-smelling roots that may indicate prolonged waterlogging or decay.

    Pests and diseases

    Some insects, mites and diseases cause yellowing or mottling. Inspect both sides of the leaves, stems and growing tips.

    Do not attribute every yellow leaf to disease unless there are additional symptoms that support the diagnosis.

    Has the weather changed?

    Cold nights, heatwaves, strong wind and sudden changes in light can all produce temporary leaf damage. A recently planted specimen may also yellow while its root system is adjusting.

    A simple diagnostic order

    • Check whether the yellowing is normal seasonal ageing.
    • Check soil or compost moisture.
    • Inspect drainage and the roots.
    • Consider recent heat, cold or transplant stress.
    • Inspect for pests and disease symptoms.
    • Only then assess feeding and nutrient availability.

    Treat the cause, not the colour

    Once a leaf has turned fully yellow, it will often not become green again. Success should therefore be judged by the new growth that follows after the underlying problem is corrected.

    For moisture management, read Watering the garden in dry weather. For compost and growing media, see Peat-free compost in the garden.