How to Grow Lavender from Seed in South Africa
Lavender is slow and sometimes uneven from seed, but it is reliable when the seed form, species, depth, temperature and drainage are kept exact. This guide covers only six Gardening.co.za products: four English lavender products identified as Lavandula angustifolia and the Bandera Deep Purple and Deep Rose Spanish lavenders, which are Lavandula stoechas.
Quick Grow Facts
Avignon Early Blue and Blue Spear
Seed-form evidence: Gardening variants and labels: raw. Current breeder table: PRM/primed. The purchased packet controls.
Packet depth: 3 mm
Germination evidence: Breeder: cover, light, 18–20°C and 4–5 controlled days. Packet: 14–21 days.
Final spacing and outcome: Use 30 cm for airflow; packets list 25 × 25 cm. Compact to medium blue-flowered L. angustifolia.
Ellagance Snow
Seed-form evidence: Gardening variants, current label and historic exact Snow listing: raw. Current Ellagance-series table: PRM/primed. The purchased packet controls.
Packet depth: 3 mm
Germination evidence: Breeder series: cover, light, 18–20°C and 4–5 controlled days. Packet: 14–21 days.
Final spacing and outcome: 25–30 cm. White-flowered L. angustifolia, about 30–35 cm high and 25–30 cm wide.
True Lavender
Seed-form evidence: Gardening variants and label: raw. No exact breeder treatment sheet is attached to this open-seed product.
Packet depth: 3 mm
Germination evidence: Packet: 14–21 days. Start about 18–20°C; no current packet chilling instruction.
Final spacing and outcome: 25 cm. Current Gardening copy identifies L. angustifolia, about 30–50 cm high and 20–25 cm wide.
Bandera Deep Purple and Deep Rose
Seed-form evidence: Gardening variants, labels and breeder: raw.
Packet depth: 1 mm
Germination evidence: Breeder: cover, light, 18–20°C and 3–5 controlled days. Packet: 14–21 days.
Final spacing and outcome: 30–36 cm. First-year-flowering L. stoechas, about 18–23 cm high and 25–30 cm wide.
Species and Series Sections
Avignon Early Blue and Blue Spear — Lavandula angustifolia
Both are current PanAmerican English lavender selections. Avignon is about 25–30 cm high and 23–28 cm wide; Blue Spear is about 28–33 cm high and 23–28 cm wide with more upright, prominent spikes. Current packets say raw, 3 mm deep, 14–21 days and 25 × 25 cm. The breeder gives 18–20°C, light, seed cover, 4–5 controlled days and 30 cm spacing. Keep both values visible: use the packet depth and allow the home timing, while giving mature plants 30 cm where airflow matters.
Ellagance Snow — Lavandula angustifolia
Ellagance Snow is a white-flowered English lavender about 30–35 cm high and 25–30 cm wide. The historic exact Snow listing and current Gardening packet say raw; the current Ellagance-series propagation table says PRM/primed. Cover about 3 mm, keep at 18–20°C in bright filtered light and space 25–30 cm apart. Snow is slower to finish than purple Ellagance selections, so do not compare flowering dates across colours.
True Lavender — current Gardening identification: Lavandula angustifolia
This open-seed product is sold as raw seed, and the current Gardening product identifies it as L. angustifolia. The packet gives 3 mm, 14–21 days and 25 × 25 cm but no breeder temperature, priming or chilling statement. Start at about 18–20°C, keep the cover shallow and use the purchased packet if a newer lot differs. Expect more natural variability than in a named uniform series.
Bandera Deep Purple and Deep Rose — Lavandula stoechas
Bandera is Spanish lavender, not an English-lavender substitute. It is a compact, mounded, first-year-flowering seed series about 18–23 cm high and 25–30 cm wide. The seed is raw. Cover about 1 mm, keep at 18–20°C with light and even moisture, and use 30–36 cm final spacing. The breeder reports 3–5 days from 50% to maximum emergence under controlled production; the packet allows 14–21 days at home. No pinching is normally needed. Keep the plug crown level with the surrounding soil because low branching and trapped moisture increase Botrytis risk.
Do Lavender Seeds Need Chilling?
Do not impose blanket cold stratification on these six current products. Their current packets do not instruct it, and the named breeder propagation methods begin directly at 18–20°C. Cold treatment of seed is different from chilling established young plants for flowering. If a future packet or lot-specific supplier sheet prescribes seed chilling, that exact instruction overrides this guide.
When to Sow in South Africa
Winter-rainfall Western Cape
Sow under cover in late summer to early autumn while 18–20°C is manageable, or in late winter before dry spring weather. Protect trays from driving rain. Plant into a raised or sloping, sharply drained site as prolonged winter wetness eases. Gravel mulch can keep the crown dry; keep organic mulch away from the stem base.
Frost-prone interior
Start in protected trays in late winter and plant out after severe frost, or sow in early autumn only where young plants can be sheltered through winter. Harden plants gradually to sun, wind and cooler nights. Established English lavender tolerates cold better than tender, wet seedlings; container roots and Bandera need more protection.
Humid coast and KZN Midlands
Choose the coolest, least humid practical sowing and planting window. Use full morning-to-midday sun, raised gravelly soil, the widest listed spacing, early-day soil-level watering and strong airflow. Do not crowd Bandera, bury any lavender crown or leave wet organic mulch against the plant. Persistent warmth plus wet foliage raises Botrytis, leaf-spot and root-rot risk.
Hot-dry or subtropical interior
Sow in a mild spring or autumn window and protect small transplants from exceptional afternoon heat while roots establish. Mature plants need full light for compact growth and flowering, but new seedlings must not dry out. Water deeply and less often after establishment rather than applying frequent shallow irrigation.
How to Sow Lavender Seed
- Use clean trays or deep cells and a fine, low-salt, very free-draining seedling mix. Moisten it before sowing.
- Read the purchased variant and packet. The six current Gardening variants are labelled raw, but current breeder tables conflict for three named English-lavender products.
- Place seed on the surface, then cover English lavender about 3 mm and Bandera about 1 mm, matching the current packets. Keep the tray in bright filtered light.
- Maintain about 18–20°C and even moisture with air still present in the mix. Do not leave the tray saturated or let the shallow seed zone dry hard.
- Expect named breeder seed to begin quickly in controlled conditions, but allow the current packet window of 14–21 days at home. Keep a sound tray for several extra days if emergence is uneven.
- Remove humidity covers as seedlings emerge. Give bright light, cooler moving air and progressively less surface moisture.
Transplanting and Ongoing Care
Pot on when roots hold the plug together and true leaves can be handled; named breeder schedules are usually about six to eight plug weeks. Lift by a leaf or root ball, not the stem. Keep the crown at soil level, harden gradually and plant into full sun and lean, well-drained soil. Water through establishment, then water deeply and allow the upper soil to begin drying. Feed lightly; excessive nitrogen produces soft growth and fewer flowers. Space before foliage touches. Prune lightly after flowering while green leaves remain below the cut, and never cut hard into old leafless wood.
Flowers, Cutting and Mature Use
Avignon and Blue Spear produce blue English-lavender spikes; Ellagance Snow produces white spikes; True Lavender produces the classic violet-blue English-lavender effect; Bandera makes compact purple or deep-rose topped flower heads. For ornamental cutting or drying, harvest when the first lower florets open and dry small bundles in shade with airflow. These uses do not authorise food, medicine, therapeutic products or essential-oil claims.
Why Germination or Establishment Fails
- No emergence: the seed was buried deeper than the packet depth, the shallow layer dried, the tray stayed too warm, or the seed is old. Recheck temperature and moisture before adding any unlisted pretreatment.
- Patchy emergence: home conditions are less uniform than breeder trials, or seed treatment/age differs. Keep the tray stable through the packet window and record the lot.
- Seedlings collapse: saturated mix, stagnant humidity or poor hygiene caused damping-off. Increase airflow and reduce surface wetness.
- Yellow Bandera seedlings: very high pH can cause chlorosis; the breeder flags pH above 6.8.
- Crown or root rot: the plug was planted deeply, drainage is poor, mulch touches the crown, or humid foliage remains wet overnight.
- Soft growth with few flowers: light is too weak or nitrogen is excessive.
- Open, woody plants: pruning was delayed or cut into bare old wood. Use light post-flower trimming while green growth remains.
Inspect for aphids, mites, leaf spot, Botrytis and root rot. Correct airflow, watering and drainage first. If a pesticide or fungicide is needed, use only a product registered for the crop and problem in South Africa and follow its label.