Lavender: the simple spring trick for more summer flowers

A simple springtime trick can make this dream surprisingly realistic.

Many gardens present a rather sad sight in summer: a few sparse lavender flower spikes, dried-out twigs and very little fragrance. Everything may appear to be right – plenty of sun, regular watering and perhaps even costly specialist compost. Yet the crucial mistake often lies in the soil. Providing lavender with the right natural ingredients in spring can noticeably boost its flowering by high summer.

Why garden lavender often disappoints

Lavender is regarded as a hardy, low-maintenance plant. In reality, attempts to grow it in a front garden often result in sparse shrubs and weak shoots. The reason is that many people treat lavender like a typical bedding plant – which is entirely at odds with its origins.

In the wild, lavender grows in poor, stony areas around the Mediterranean. The soils there are low in nutrients, rich in lime and exceptionally free-draining. These are exactly the conditions to which the plant has adapted.

“Lavender loves poor, fairly stony soil – not the rich, dark ‘dream soil’ that many gardeners aim for.”

If the soil contains too many nutrients, lavender responds by producing lots of foliage, feeble stems and considerably fewer flowers. Common mistakes include:

• adding too much compost or all-purpose fertiliser to the bed
• growing it in heavy, clay-rich soil without drainage
• applying a thick layer of bark mulch that traps moisture
• feeding it regularly as you would roses or geraniums

As a result, the plant may look lush and green for a while in spring, but it will barely manage to create a proper sea of flowers in July.

The ideal time: care for lavender once in spring instead of feeding it constantly

What matters is not care during high summer, but preparation in spring. Taking action in March or April sets the course for a spectacular summer display.

In the UK, once hard frosts have passed but before the first buds are clearly visible, the plant can be put in the best position for its flowering summer. One carefully targeted nutrient boost is then enough – lavender generally needs no more.

“A light, targeted feed once in spring works better than repeatedly adding more throughout the summer.”

This preserves the plant’s natural character: tough, drought tolerant and compact. Treating it as a heavy feeder, by contrast, turns this sun-loving subshrub into a delicate “diva plant” with only brief flowering spells.

The three-part recipe: three natural ingredients for a summer cloud of lavender

A straightforward blend of three readily available natural ingredients has proved especially effective. It can be prepared at home with very little effort and suits the plant’s needs perfectly:

• Mature compost – provides gentle nutrients and improves the soil structure.
• Bone meal – supplies phosphorus and calcium, both important for roots and flower formation.
• Garden lime or ground limestone – increases the soil’s lime content, mirroring lavender’s natural habitat.

Use roughly equal quantities of each ingredient in a bucket. The blend is not intended as a powerful fertiliser; instead, it gently supports the plant and adjusts the soil to meet lavender’s requirements.

Ingredient	Effect on the plant
Compost	feeds gradually, opens up the soil and encourages soil life
Bone meal	stimulates root growth and bud development
Lime	stabilises the pH level and creates the lime-rich soil lavender loves

How to apply natural lavender fertiliser correctly

Apply the mixture in a ring around the plant rather than placing it directly against the stem. This method works in beds as well as in pots.

• Loosen the soil: Carefully open up the top layer around the root zone using a small hoe or hand cultivator.
• Apply the mixture:
  • young plant: one small handful
  • older, vigorous shrub: around two handfuls
  • potted lavender: use a more sparing amount, as space is limited
• Work it in: Gently mix the blend into the top few centimetres of soil; do not bury it deeply.
• Water afterwards: Give the plant one thorough watering so that nutrients can reach the roots.

“Use a little, apply it precisely and water it in well – that is the most reliable way for a spring treatment to work on lavender.”

If you have several plants in a row, treat them individually. Particularly with older lavender hedges, it often becomes clear in summer which plants received their spring feeding – the flowers there are denser and last longer.

Common mistakes that hold back flowering in July

Too much fertiliser is not the only issue: water and soil structure also play a key part. Lavender does not like a bone-dry root ball in spring, but it is sensitive to constantly wet conditions.

In particular, avoid:

• Waterlogging caused by dense, heavy soil or a pot without drainage.
• A permanently damp root area beneath a thick layer of bark mulch.
• Nitrogen-rich fertilisers such as lawn feed or fresh farmyard manure, which encourage leaves rather than flowers.
• Frequent feeding in summer through fear of a “deficiency”. Lavender copes better with lean conditions than with overfeeding.

Giving your lavender the three-part mixture once in March or April, placing it in full sun and consistently preventing waterlogging creates the foundation for a visible difference in July: more flowers, clearer colour and a stronger scent.

How position, pruning and variety affect lavender flowering

Nutrients are only one part of the picture. Three further factors also determine how impressive the plant looks in high summer:

Sun and wind

Lavender needs a position that receives as much full sun as possible. Three or four hours of sunshine a day is hardly sufficient; ideally, the site should be bright from late morning until early evening. A little wind does no harm – it dries wet leaves and helps prevent rot.

Pruning at the right time

Never cutting lavender risks producing woody shrubs that are bare in the middle, with only a few flowers at the tips. A light shaping trim straight after the main flowering period, followed by gentle cutting back in early spring, keeps the plant youthful. Do not cut into old wood, as it does not regrow well.

Choosing the right variety

Garden centres offer numerous species and cultivars: traditional English lavender, the more frost-sensitive French lavender, and compact varieties for window boxes. In colder areas especially, it is worth checking the label: hardy types of lavender make it through winter more reliably and get off to a better start again in spring.

Practical examples for beds, pots and balconies

In a garden bed, lavender is ideally suited to stony or Mediterranean-style areas. It thrives among gravel, stones and drought-tolerant companions such as thyme, sage or ornamental grasses. The soil’s natural lack of nutrients is often enough in such places; the three-part mixture merely provides a small additional boost for flowering.

The situation differs in a pot. Containers dry out more quickly, nutrients are more concentrated and mistakes have a greater effect. A free-draining growing medium made from herb compost, sand and a little gravel is helpful here. Use the fertiliser blend much more sparingly, while a good drainage layer of expanded clay or gravel in the pot is essential.

Why the springtime trick brings several benefits

The spring application does more than influence July flowering. It strengthens the plant in several ways:

• improved root growth – lavender copes more easily with dry spells in summer
• sturdier shoots – less likely to flop over in rain or wind
• more flowers – making it more attractive to bees, bumblebees and other pollinators
• a longer lifespan – plants become woody more slowly and stay more compact

Anyone who has struggled for years with lavender shrubs that flower poorly can try a fresh start next spring with this simple combination of compost, bone meal and lime. In many gardens, one season alone is enough to reveal a clear difference – particularly if the position is made sunnier and the soil a little leaner at the same time.