Soil & potting mix
Best soil for Spike lavender (Lavandula latifolia)
Also called Spike lavender, Broad-leaved lavender, Portuguese lavender.
More about spike lavender
About Spike lavender
Lavandula latifolia · also called Spike lavender, Broad-leaved lavender · herb
Spike lavender is a robust, camphor-scented Mediterranean herb valued for its essential oil and tall flower spikes. It thrives in full sun with sharply drained, poor-to-average soil and extreme drought tolerance once established. Slightly coarser than English lavender, it blooms mid to late summer and tolerates hotter, more humid summers than its relatives.
Preferred mix: Lean, sharply drained alkaline to neutral loam or sandy soil; pH 6.5–7.5
Watch for — Root and crown rot: The most common cause of plant death — caused by waterlogged soil or heavy clay. Ensure drainage is sharp; raised beds or gravel mulch can help in wet UK gardens.
Why spike lavender needs this mix
Spike lavender is a Mediterranean dry-hillside plant — it wants a lean, sharply drained, slightly alkaline mix, and rots fast in rich, water-holding soil.
- Spike lavender evolved on stony, sun-baked slopes — its roots expect to dry out hard and quickly between rains, so the mix must drain almost as fast as you pour.
- A lean, low-nutrient mix keeps growth firm and aromatic; a rich one gives soft, sappy, flavourless growth that flops and rots.
- It tolerates and often prefers a slightly alkaline soil, the opposite of most houseplants.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons spike lavender struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Rich, moisture-holding compost is the classic killer of spike lavender — especially over a cold, wet winter, when the base of the plant simply rots.
- A peaty, acidic potting mix is doubly wrong: too wet and the wrong pH direction.
- No grit means the rootball stays damp for days, which a dry-climate root system never copes with.
Growing spike lavender in ordinary rich, moisture-retentive compost. Lean it out with at least a third grit, and never let it sit wet over winter.
pH — does it matter for spike lavender?
Spike lavender likes neutral to slightly alkaline soil, roughly pH 6.5-7.5. If your soil or compost is acidic, a little garden lime or extra grit nudges it the right way — the one common plant where you may add lime.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
Bagged "herb" or "Mediterranean" mixes are usually fine for spike lavender, but most standard composts need cutting hard with grit. The DIY ratio above is cheap and exactly right.
Drainage and the pot
Sharp drainage is everything: a terracotta pot with a big hole, gritty mix and never a saucer left full. Raised beds suit these herbs outdoors for the same reason.
A gritty mix barely breaks down, so spike lavender needs little repotting — refresh the top layer and the grit every couple of years rather than potting on aggressively. When the time comes, our repotting guide for spike lavender covers the timing and technique step by step.
Spike lavender soil — frequently asked questions
What is the best soil mix for spike lavender?
2 parts standard peat-free compost or loam : 1 part coarse horticultural grit : 1 part perlite or coarse sand. Spike lavender evolved on stony, sun-baked slopes — its roots expect to dry out hard and quickly between rains, so the mix must drain almost as fast as you pour.
Can I use normal potting soil for spike lavender?
Rich, moisture-holding compost is the classic killer of spike lavender — especially over a cold, wet winter, when the base of the plant simply rots. Bagged "herb" or "Mediterranean" mixes are usually fine for spike lavender, but most standard composts need cutting hard with grit. The DIY ratio above is cheap and exactly right.
Does spike lavender need a special pH?
Spike lavender likes neutral to slightly alkaline soil, roughly pH 6.5-7.5. If your soil or compost is acidic, a little garden lime or extra grit nudges it the right way — the one common plant where you may add lime.
Should I buy a bagged mix or make my own for spike lavender?
Bagged "herb" or "Mediterranean" mixes are usually fine for spike lavender, but most standard composts need cutting hard with grit. The DIY ratio above is cheap and exactly right.
How often should I refresh the soil for spike lavender?
A gritty mix barely breaks down, so spike lavender needs little repotting — refresh the top layer and the grit every couple of years rather than potting on aggressively. Sharp drainage is everything: a terracotta pot with a big hole, gritty mix and never a saucer left full. Raised beds suit these herbs outdoors for the same reason.
Keep reading
- Spike lavender care — the full brief (light, water, humidity, problems, pet safety)
- How often to water spike lavender — the schedule the mix feeds into
- Repotting spike lavender — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Overwatered plant — signs and recovery
- Root rot — how the wrong soil starts it, and how to save the plant
- Should I water my plant? The simple check first
- Best soil for curly parsley
- Best soil for garlic chives
- Best soil for lavandin
- All 6887 soil and potting-mix guides in the Growli library