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French lavender grows at a moderate pace, typically adding about 6 to 12 inches of height per year under ideal conditions.
That means it’s not the fastest lavender you can plant, but it’s far from the slowest either.
If you’re wondering exactly how fast French lavender grows, the honest answer depends on a mix of sunlight, soil, climate, and how you care for it.
In this post, we’ll break down the growth rate of French lavender, what speeds it up, what slows it down, and how long you can expect to wait before it reaches full size.
Let’s dig in.
How Fast Does French Lavender Grow?
French lavender grows faster than English lavender in most climates, especially during its first two to three years.
On average, you can expect your French lavender to grow about 6 to 12 inches per growing season.
That’s a solid growth rate for a shrub that also rewards you with those distinctive flower spikes and fragrant foliage.
How fast French lavender grows also depends on whether you started it from seed, a cutting, or a nursery plant.
Nursery plants tend to establish faster and can put on closer to 12 inches in their first year.
Seed-grown French lavender, on the other hand, tends to grow more slowly at first because it’s busy building roots.
1. Growth Rate by Age
Young French lavender plants focus their energy on roots before tops.
In year one, you might only see 4 to 6 inches of new growth above ground.
By year two, French lavender growth speeds up noticeably, often adding 8 to 10 inches.
Once established in year three and beyond, French lavender grows steadily but slows a bit as it matures.
2. Growth Rate by Season
French lavender grows fastest in spring and early summer.
That’s when warm temperatures and longer days push new stems and leaves.
Growth slows in the peak heat of midsummer, especially in hot, dry regions.
In mild climates, French lavender may put on a second flush of growth in early fall.
Winter is basically a rest period, so don’t expect much growth then.
Factors That Affect How Fast French Lavender Grows
How fast French lavender grows isn’t just about the plant itself.
Several outside factors can either speed things up or hold your lavender back.
1. Sunlight
French lavender needs at least 6 to 8 hours of full sun daily.
The more direct sun it gets, the faster French lavender grows and the more flowers it produces.
Shade slows growth and makes plants leggy and spindly.
2. Soil Drainage
French lavender hates soggy roots.
Well-draining, sandy, or gravelly soil keeps growth steady.
If soil stays wet, French lavender growth stalls and root rot becomes a real risk.
3. Temperature and Climate
French lavender thrives in warm, dry conditions.
It’s less cold-hardy than English lavender, so frost can slow or damage growth.
In USDA zones 8 to 11, French lavender grows fastest.
In cooler zones, treat it as an annual or grow it in containers you can move indoors.
4. Watering Habits
Water deeply but let soil dry between waterings.
Overwatering is the number one reason French lavender grows slowly or dies.
Once established, French lavender is fairly drought-tolerant.
5. Pruning
Light pruning after flowering encourages bushier growth.
Regular trimming keeps French lavender from getting woody and leggy.
Don’t cut into old wood, though, because French lavender rarely regrows from it.
How Long Until French Lavender Reaches Full Size?
French lavender typically reaches its full size in about 2 to 3 years.
At maturity, most French lavender plants grow 2 to 3 feet tall and wide.
Some varieties stay smaller, around 18 inches, while others stretch closer to 3 feet.
If you’re growing French lavender in a container, growth will be slower and the plant will stay smaller.
That’s because potted lavender has less root space and dries out faster.
How to Make French Lavender Grow Faster
If you want to speed up how fast French lavender grows, here’s what to do.
1. Start With the Right Variety
Choose a French lavender variety suited to your climate.
Popular options like ‘Papillon’ or ‘Goodwin Creek Grey’ grow reliably well in warm regions.
2. Plant in Full Sun
Pick the sunniest spot in your garden.
More sun equals faster growth and better blooming.
3. Improve Soil Drainage
Mix in sand or grit if your soil is heavy clay.
Raised beds or slopes work great for French lavender.
4. Avoid Overwatering
Let the top inch of soil dry out before watering again.
Less is more when it comes to French lavender.
5. Feed Lightly
Too much fertilizer makes French lavender grow soft and floppy.
A light dose of balanced fertilizer in spring is plenty.
So, How Fast Does French Lavender Grow?
French lavender grows at a moderate pace, adding roughly 6 to 12 inches per year in good conditions.
It’ll reach full size in about 2 to 3 years with plenty of sun, well-drained soil, and careful watering.
Factors like climate, pruning, and container growing all affect how fast French lavender grows.
Give it the right environment, and you’ll enjoy a healthy, fragrant French lavender plant for years to come.