When to plant lavender in Kent, Renton and Auburn, WA

Plant lavender plants in Kent, Renton and Auburn Mar 15 – May 10.

Easy Plant young plants

Difficulty: Easy
Sun: Full sun
Spacing: 18 to 36 inches apart, depending on variety
Planting depth: Plant at the depth it grew in the nursery pot
Frost: English types handle about −10°F in well-drained soil
First harvest: Light blooms the first summer; full harvests from year two

Why these dates

Kent, Renton and Auburn's typical last spring frost is March 20. As a hardy perennial, this crop doesn't need to wait for that date. In the west-side valleys, though, the soil usually isn't ready to work until about March 15.

West-side valleys. The Willamette Valley, Puget Sound and southern Oregon valleys. Long frost-free seasons, but soil stays cold and wet into May, so warm crops wait for warm soil, not just the last frost.

How to grow lavender in Kent, Renton and Auburn

Pick a sunny spot with soil that drains well, and mix in an inch or two of compost.
Plant lavender plants Mar 15 – May 10, 18 to 36 inches apart, depending on variety. Plant at the depth it grew in the nursery pot.
Water through the first summer only. After flowering, cut plants back by about a third, but never into bare, leafless wood, which won't regrow.
Harvest: For drying, cut stems when the lowest flowers on each spike have just opened. Hang small bunches upside down in a dark, airy place.

Key numbers

6.5–8.0Soil pH
First summer onlyWater
After bloom, by a thirdPrune
Wet winter soilBiggest risk

Growing notes

What makes the difference in Northwest gardens, in plain language.

Drainage and soil

Lavender grows wild on dry, rocky hillsides, and its roots need air as much as water. In the heavy, wet soils common west of the Cascades, roots rot over winter. Plant on a mound, slope or raised bed with gravelly soil, and use gravel instead of bark mulch, which holds moisture against the crown.

Lavender likes neutral to slightly alkaline soil and very little fertilizer. Rich soil grows soft, floppy plants that are less fragrant and more likely to die in winter. Water through the first summer, then only in long droughts.

English lavender vs lavandin

English lavenders like Hidcote and Munstead are compact, very cold hardy and the best choice for cooking, with a sweet scent. Lavandins like Grosso are hybrids that grow larger, bloom a bit later and have a stronger, more camphor-like scent. They're the classic choice for drying, sachets and oil, but they're slightly less cold hardy.

Spanish lavender, with its rabbit-ear petals, is the least hardy and often dies in cold eastern winters.

Pruning and lifespan

Lavender turns woody as it ages, and it won't sprout from old, bare wood. The fix is regular pruning: right after flowering, cut each plant back by about a third, leaving green, leafy growth below the cut. Plants pruned this way every year stay rounded and full for many years.

East of the Cascades, dry summers and well-drained soils suit lavender well, but cold winter winds can dry out plants; a sheltered spot helps.

Common questions

When is the last frost in Kent, Renton and Auburn, WA?

Typically March 20. In 9 years out of 10, frost is over by April 8. These are 1991–2020 NOAA climate normals for Kent.

Is it too late to plant lavender in Kent, Renton and Auburn?

The spring planting window runs through May 10. Potted plants can still go in later if you water them faithfully through their first summer. Fall planting also works well here.

How long until I can pick lavender?

Light blooms the first summer; full harvests from year two. For drying, cut stems when the lowest flowers on each spike have just opened. Hang small bunches upside down in a dark, airy place.

Why is my lavender dying?

Most often it's wet roots, from heavy soil, poor drainage, overwatering or bark mulch against the crown. Old, woody plants that were never pruned also decline. Replant in a mound of gravelly soil and prune yearly after bloom.

Can I cook with any lavender?

English lavenders like Hidcote and Munstead have the sweetest flavor and are the usual culinary choice. Lavandins like Grosso taste stronger and more bitter. Use a light hand, since a little goes a long way.

When should I prune lavender?

Right after the main bloom in summer, cutting back by about a third into leafy growth. A light tidy in spring is fine, but never cut into bare wood with no leaves, which won't regrow.

Also plant in Kent, Renton and Auburn around the same time

Planting dates for lavender in nearby areas

Seattle and Tacoma, WA Mar 15 – May 10
Everett, WA Mar 15 – May 10
Olympia, WA Apr 1 – May 27
Bremerton and Port Orchard, WA Mar 15 – May 10
Shelton, WA Mar 30 – May 25
Portland, OR Mar 15 – May 10

Full planting calendar for Kent, Renton and Auburn · Lavender in every city