~ welcome, friend ~

Growing Lavender
in Grow Bags

A grow bags growing guide for lavender — container size, soil mix, watering, and the mistakes that quietly kill your yields.

🌱Medium difficulty
🪣2 gal min
📅90-100 days
☀Full Sun
⏱Low maintenance
Published

Quick answer: Lavender grows well in grow bags. Use a 2-gallon, 12"-deep bag with sandy; gritty; lean; well-drained; alkaline tolerant, pH 6.5-7.5. Check daily; fabric loses moisture fast through the sides and may need 1-2 waterings per day in summer heat. Feed weekly with 5-10-10. Expect harvest in 90-100 days, yielding Continuous flowers and oil.

Why do grow bags work for lavender?

Fabric walls air-prune roots and let excess moisture evaporate through the sides, preventing the root circling that happens in rigid containers.

For lavender specifically (Lavandula angustifolia, Lamiaceae family, Perennial edible), this matters because lavender are heavy-rooted, high-water plants that need fast drainage. The controlled root environment lets you dial water and nutrients in tighter than open-ground growing allows.

"Get the grow bags substrate and water rhythm right and the rest is variety choice. Get either wrong and no cultivar saves you."

Lavender container sizing, soil, and setup

Soil recipe

From the grow bags specialist playbook: 50% potting mix, 25% compost, 25% perlite for extra drainage.

Lavender-specific tweak: lavender prefer pH 6.5–7.5, soil type sandy; gritty; lean; well-drained; alkaline tolerant. Most quality potting mixes land in that range out of the bag — test before adjusting.

The build: setting up grow bags for lavender

  1. Choose your grow bags. 2-gallon minimum, 12" deep. Black is fine indoors; choose tan or grey for outdoor desert/hot-summer settings.
  2. Mix the soil. 50% potting mix, 25% compost, 25% perlite for extra drainage. Mix in a wheelbarrow or tarp before filling.
  3. Fill and transplant. Fill to 2 inches below the rim. Transplant.
  4. Water in. Soak until water drains through the fabric walls (yes, the sides will weep — that's normal).
  5. Position in sun. 6–10 hours direct Full Sun. Elevate dark-colored pots off hot concrete on a plant caddy.
  6. Mark feeding schedule. Begin weekly feeding 2 weeks after transplant with 5-10-10 fertilizer.

Best lavender varieties for grow bags

Grow Bags work for any lavender type, but the fast root-zone drying favors plants that handle steady deep watering. Top picks from breeders' lists (varieties verified via All-America Selections and university extension trials):

Care: water

Method baseline: Check daily; fabric loses moisture fast through the sides and may need 1-2 waterings per day in summer heat.

Lavender-specific: the baseline holds for lavender (water_category: Low, baseline 7 days), with adjustments:

Lavender fertilizer routine for grow bags

Method baseline: Weekly liquid feed; nutrients flush out faster than in plastic pots, so consistency matters more than dose size.

Lavender-specific: lavender are a light feeder. Use 5-10-10 (low-nitrogen, high-phosphorus/potassium) once flowers appear. High-nitrogen fertilizer in grow bags gives you a beautiful leafy plant with zero fruit. Start feeding 2 weeks after transplant, then weekly through the harvest window.

Care: sun

Method baseline: 6+ hours of sun; dark-colored fabric heats the root zone fast, so choose light colors or shade the base in hot climates.

Lavender-specific: lavender want 6–10 hours of Full Sun. South or west exposure is ideal. If you're growing on a balcony with only morning sun, choose compact varieties (more forgiving with less light) and skip the long-season heirlooms.

Pollination notes for lavender growers

Lavenders are self-pollinating — a single plant will set fruit on its own through wind or gentle shaking. First flowers typically appear 90 days after transplant. In grow bags, the air-pruned root system actually produces flowers a few days earlier than in rigid containers — a nice side bonus.

Pollination tip for indoor grow bags: hand-pollinate by tapping the cage gently once flowers open, or use an electric toothbrush against the stem for 1 second per cluster. Vibration shakes pollen loose like a bee would.

Common mistakes

Grow Bags mistakes (top 3)

  1. Underwatering.
  2. Placing directly on hot concrete.
  3. Reusing soil without amending between seasons.

Lavender mistakes

  1. Overwatering causing root rot.
  2. Heavy soils retaining moisture.
  3. Planting in shade.
  4. Over-fertilizing reducing oil.
  5. Pruning into old wood (will not regrow).
  6. High humidity without airflow leading to fungal issues.

Pest & disease pressure for lavender in grow bags

Common pests: aphids; spittlebugs; whiteflies.

Common diseases: root rot (Phytophthora); fungal leaf spot; shab disease; botrytis.

Grow Bags keeps soil-borne disease pressure low when the substrate is fresh and clean. Spider mites still come for dry-summer plants; mist the underside of leaves weekly if you see stippling.

Keeping lavender tidy in grow bags

Method routine: Hose down between seasons, air-dry fully before storage, and plan to replace bags every 2-4 years as fabric degrades.

Lavender-specific: Prune by one-third after flowering; never cut into old woody growth; shape in early spring; harvest just before full bloom Growth rate: Slow.

Bringing the lavender in from grow bags

Expect Continuous flowers and oil in grow bags (roughly 70-80% of ground-grown yield). Harvest window: 30 days from first ripe fruit. Standard harvest months: Jun; Jul; Aug; year-round indoors with grow lights.

What you harvest: flowers; leaves. Culinary uses: Culinary lavender in baking; sugars; lemonade; herbes de Provence; tea; ice cream; essential oil; sachets; potpourri

Keeping pets and wildlife safe around lavender

Wildlife value: bees; butterflies; hummingbirds; pollinator magnet; deer and rabbit resistant. Originally from Mediterranean region (France; Spain; Italy).

Deer resistant: Yes · Rabbit resistant: Yes. Elevated containers on a balcony or fenced patio solve deer/rabbit pressure naturally.
Pet safety: Toxic to cats: No · Toxic to dogs: No. Non-toxic per ASPCA in normal amounts; essential oil concentrated form may cause GI upset in pets; flowers safe in culinary use; per ASPCA

Pro tip from the grow bags playbook

Bury an open-ended PVC pipe vertically in the bag - pour water into the pipe to deliver it straight to deep roots without surface runoff.

Grower's tip for Lavender

Excellent drainage essential; add perlite or grit to potting mix; terracotta containers preferred for moisture wicking; full sun mandatory; do not over-fertilize; zones 3-4 overwinter indoors; SE USA humidity is challenging; harvest just before flowers fully open for best oil

Lavender in grow bags, answered

Can I use grow bags for lavender indoors?

Yes, with a saucer. Grow Bags weep water through the sides for the first few days after watering — protect indoor floors with a tray or saucer that catches sideways drips, not just bottom drainage. Light requirement: 6–10 hours of Full Sun, so plan supplemental grow lights for low-light rooms.

What size grow bags do I need for lavender?

2 gallons absolute minimum, 12" deep. The practical sweet spot is 4 gallons for steady production. Larger is better for indeterminate or high-yield growing.

How often should I water lavender in grow bags?

Check daily; fabric loses moisture fast through the sides and may need 1-2 waterings per day in summer heat.

Will lavender grow as well in grow bags as in the ground?

Yield is roughly 70-80% of ground-grown for the same variety, but plant health is often better — fewer soil-borne disease problems and no competition from other roots. For most home growers, grow bags are a net win.

How long do grow bags last?

2-4 years outdoors before UV degrades the fabric. Up to 6 years if stored indoors during winter and dried completely before folding.

What soil mix works best for lavender in grow bags?

50% potting mix, 25% compost, 25% perlite for extra drainage. The extra perlite compensates for fabric's fast moisture loss while keeping the root zone aerated.

Do grow bags get too hot in summer?

Dark-colored grow bags can heat the soil 10-15°F above ambient in direct afternoon sun. Use tan or light grey fabric for hot climates, mulch the soil surface 3-4 inches deep with straw, and elevate pots off concrete or pavers on a plant caddy or wood block.

Can grow bags be reused across seasons?

Yes — rinse inside and out at season's end, dry completely before folding, store flat indoors. Expect 2-4 years of outdoor use before UV degrades the fabric. Replacements run $5-12 per pot in 3-packs.

Recommended products

Affiliate disclosure: links may be affiliate links. We only recommend products we use ourselves.

References used on this page

Climate, geographic, and toxicity data on this page come from public datasets. Cultivar profiles and growing recommendations draw on land-grant university extension research.