Lavender is often described as an easy garden plant, and it can be, but only when it is growing in conditions it likes. Give it sunshine and freely draining soil and it may become a fragrant, long-lived feature along a path or beside a patio. Plant it in heavy, damp ground that stays wet through winter and it can decline surprisingly quickly.
Most disappointing lavender plants suffer from too little light, too much moisture or unsuitable pruning. Getting those three things right matters far more than applying expensive feeds or following elaborate seasonal routines.
Start with the right lavender
The word 'lavender' covers several types with different habits and hardiness. English lavender, Lavandula angustifolia, includes many familiar garden varieties. Lavandin, Lavandula × intermedia, can grow larger and produce long flowering stems. French lavender, Lavandula stoechas, has distinctive tufted flower heads but is generally less hardy than the tougher English types.
In colder or wetter UK gardens, a reliably hardy English lavender is usually the most forgiving first choice. Check the expected height and width: a compact lavender edging a narrow path makes sense, while a much larger cultivar can overwhelm the same space.
You can buy young plants in pots, rooted cuttings or occasionally raise some types from seed. Look for firm, healthy shoots and compost that isn't waterlogged. Soft roots or blackened stems are warning signs. Don't choose a plant just because it is already covered in flowers if the roots and stems look stressed.
Where to plant lavender
Choose a site with plenty of direct sun and good air movement. Lavender is commonly used in gravel gardens, sunny borders and coastal planting because it copes well with fairly dry conditions once established.
The soil must drain. Lavender dislikes persistently wet, heavy ground, especially during winter. If you have dense clay that holds puddles, consider a raised bed, a substantial container or a different plant for that location. Simply putting gravel into the base of a poorly draining planting hole will not necessarily fix the surrounding soil.
Avoid placing lavender under dense trees or close to vigorous shrubs that will grow over it. What looks sunny in spring may become deeply shaded by midsummer. The plant needs light along its branches to keep a compact, productive shape.
The Royal Horticultural Society advises sunny, well-drained positions and notes that English lavender types are generally hardier than several Mediterranean relatives.
When and how to plant lavender
Spring is a useful time to plant because roots can establish during the growing season before the next winter. Early autumn may also suit a well-drained, sheltered garden, but young plants have less time to settle before cold, wet conditions.
Prepare the site by removing weeds and improving soil structure if appropriate. Dig a hole large enough to accommodate the rootball, then plant at approximately the same level it occupied in its original pot. Avoid burying woody stems below wet soil.
Firm gently and water well to settle the soil around the roots. Keep the immediate area free from competing weeds while the plant establishes. Space plants according to their mature size rather than their appearance on planting day; poor spacing can create a crowded, damp thicket that is difficult to prune.
If you're making a lavender hedge, consistent spacing gives a more even result, but don't force plants so close together that they have no room for air movement. Read the supplier's mature dimensions for the variety you've chosen.
How to grow lavender in pots
Containers can solve many drainage problems and make lavender practical for balconies. Choose a pot with generous drainage holes and enough room for the plant's rootball and future growth. A heavy pot can help keep a larger shrub stable in wind.
Use a free-draining peat-free potting mix appropriate for Mediterranean-type plants. Avoid a dense compost that remains saturated for days. Position the pot in full sun and raise it slightly if its drainage holes might be blocked on a flat surface.
Newly potted lavender needs watering while its roots establish. Once settled, let the compost dry somewhat between thorough waterings. A container can dry surprisingly fast in summer, however, so don't take 'drought tolerant' to mean 'never needs water'.
In winter, keep the rootball from standing in water and protect less hardy types as needed. A pot exposes roots to greater temperature fluctuations than open ground. Move vulnerable plants to a sheltered, bright location if severe conditions are forecast.
How often should lavender be watered?
A newly planted lavender requires attention until its root system reaches the surrounding soil. Water during dry periods rather than leaving it to wilt repeatedly. An established plant in well-drained ground normally needs less supplementary water than thirstier border flowers.
Before watering a container, check how damp the compost feels beneath its surface. One or two dry-looking grains on top do not tell you what is happening around the roots. If the whole rootball is bone-dry, give it a thorough watering and allow the surplus to escape.
Yellowing leaves, wilting and browning can result from waterlogged roots as well as dryness. If the soil is already wet and the plant is declining, adding more water may make matters worse. Check drainage, planting depth and whether roots are healthy.
Lavender generally dislikes rich, wet growing conditions. Overfeeding may produce soft growth without improving the plant's long-term shape or resilience. In suitable ground it often needs little fertiliser.
Pruning lavender without ruining it
Regular, careful pruning is the difference between a tidy rounded bush and a plant that becomes woody and bare at the base. The exact timing depends on the variety and local weather, but many established English lavenders are trimmed after flowering.
Use clean shears or secateurs to remove spent flower stems and shape the soft leafy growth beneath them. Aim to retain a dome of green shoots. Avoid cutting deeply into old leafless wood: mature lavender often cannot regenerate readily from bare, woody stems.
A neglected plant with long bare branches cannot always be restored by one hard cut. If healthy green growth survives only at the tips, stage any careful renovation over time or consider replacing the plant. A replacement grown from a cutting may be more successful than leaving an ugly stump and hoping it resprouts.
French and other less hardy lavenders can require different pruning and protection, so check cultivar-specific advice. Don't copy a pruning routine blindly from an English lavender hedge onto an unfamiliar type.
How to take lavender cuttings
If a favourite lavender is growing well, taking cuttings can give you young replacements as the original plant ages. Choose healthy, non-flowering shoots of suitable maturity. Cut below a leaf joint, remove lower leaves and place the prepared cutting in free-draining propagating compost.
Keep the compost lightly moist and the cuttings sheltered in bright conditions out of fierce direct sun while roots form. Poor ventilation and saturated compost encourage rotting, so resist wrapping everything permanently in a soaking-wet cover.
Once cuttings show signs of rooting and new growth, pot them individually and grow them on before planting outside. Labelling them with the cultivar name prevents confusion when several varieties look similar before flowering.
Cuttings are particularly useful for a lavender hedge because you can produce a matching set of plants rather than relying on seed-grown variation.
Why is my lavender turning brown?
First distinguish natural woody stems from new decline. Lavender gradually develops brown, woody bases as it matures. That is normal. Sudden browning through the upper foliage is more concerning.
Wet winter conditions are a frequent problem. Check whether the ground or container remains saturated and whether branches are rotting at the base. Lavender with damaged roots may look dry above ground even while those roots are sitting in wet soil.
A plant that browns after severe frost may have been insufficiently hardy for the site. Inspect for surviving green shoots when warmer weather arrives rather than immediately pruning to the stump.
If a shrub has become sparse in the middle, years without pruning may be responsible. Young plants respond best to light, regular shaping; very old woody plants can be difficult to rejuvenate.
Harvesting lavender flowers
For drying, cut suitable flower stems when the flowers are opening and the stems are dry from rain or dew. Tie small bunches and hang them somewhere airy, dry and shaded until properly dried. Large, tightly packed bunches may trap moisture and develop mould.
Lavender scent can be used in sachets and floral decorations. If using flowers in food, make sure you have a correctly identified culinary-suitable lavender that has not been treated with unsuitable chemicals. Decorative nursery plants may have been treated with products unsuitable for edible crops, so use only appropriately identified and grown culinary flowers.
Leave some flowers for bees and other pollinators if you can; lavender is a valuable summer source of nectar. It's easy to enjoy the scent, wildlife and cutting stems without removing every flower at once.
Keeping lavender attractive for years
Choose a suitable hardy variety, plant in sunshine, keep drainage excellent and prune lightly while green growth remains. Inspect containers in winter, particularly after extended rainfall, and replace plants that have become irreversibly woody or diseased.
The secret isn't a complicated feeding schedule. Lavender succeeds when its roots stay healthy and its stems are shaped before they become a mass of bare wood. Start with the right site and the rest of the care becomes much simpler.
Source
Royal Horticultural Society, Lavender Plant Guide and its linked growing guidance.