How to Grow Begonias from Seed in South Africa
Bring long-flowering colour to South African beds, pots and baskets with begonias grown from seed. This guide shows you how to surface sow the fine seed, care for tiny seedlings and choose a growing approach for BabyWing, BIG, Dragon Wing, Hula, Nonstop, Sprint Plus or Planet Mix. Use the named module below for its own temperature, spacing and growth form.
Quick Grow Facts
- Seed form: Very fine seed; follow the relevant module for sowing. If using pellets, wet the coating after placement
- Pretreatment: No soaking, scarification or cold stratification; if sowing a pellet, wet its coating gently after placing it
- Sow depth: Surface sow and leave seed uncovered; follow the named module
- Light: Provide bright, diffused light for germination and never put a covered tray in direct sun
- Temperature: Use the named module; BabyWing, BIG, Dragon Wing, Hula, Nonstop and Sprint Plus call for 22–25°C; for Planet Mix, use around 21–24°C
- Germination: Follow the named module; emergence timing varies by series and growing conditions, and Planet Mix may take several weeks
- Method: Sow in clean trays or cells, not directly in the garden; the seed and first seedlings are too small for reliable direct sowing
- Moisture: Keep the seed and surface evenly moist through emergence, with air still available in the mix; never leave trays standing in water
- Position after hardening: Bright filtered light or morning sun is safest; use each module's sun/shade boundary and protect young plants from harsh midday exposure
- Outcome: Long-flowering ornamental plants for beds, pots or baskets; these are not cut-flower or edible crops
How to Sow Begonia Seed
- Fill clean small cells with a fine, sterile, freely drained, low-salt seedling mix. Level and pre-moisten it before sowing.
- Place seed on the surface of each cell. Do not bury it or cover it with vermiculite. Place pellets individually; handle any loose fine seed sparingly.
- Water with a fine mist or gentle bottom watering. If the seed is pelleted, wet the coating thoroughly until it starts to soften. Do not blast seed out of position.
- Keep the module temperature, bright diffused light and very high surface moisture until the radicle emerges. A clear lid can help, but vent it and keep it out of direct sun.
- After emergence, increase airflow gradually and move from continuously wet to evenly moist conditions. Never let the tiny root dry, but do not keep the mix saturated.
- Begin very dilute balanced feeding only after true leaves expand. Begonia roots are sensitive to high salts.
BabyWing White
BabyWing White is a Begonia interspecific F1. It develops an upright, mounded growth form with white flowers and suits containers and landscape beds.
- Depth, light and pretreatment: Surface sow with no cover. Light is required. No presoak or chilling is needed; if using a pellet, wet it after placement.
- Temperature and time: Maintain 22–25°C and expect germination in 7–10 days.
- Spacing and size: Space 25–30 cm apart. Mature plants are approximately 30–38 cm high and 25–30 cm wide.
- Position and outcome: Plants can perform from sun to shade after gradual hardening and with reliable water. In hot South African sites, prefer morning sun or bright filtered light. Professional timing is about 5–7 weeks from transplant to flowering; home-garden timing varies.
BIG Green Leaf Pink, Red and Rose
These three products are Begonia × benariensis F1 BIG Green Leaf selections. They are vigorous interspecific landscape begonias, not compact wax begonias.
- Depth, light and pretreatment: Surface sow with no cover. Light is required. Do not soak or chill; if using a pellet, fully wet it after placement.
- Temperature and time: Maintain 22–24°C. Radicle emergence normally takes about 6–8 days under controlled conditions.
- Spacing and size: Allow 40–50 cm between plants, using the wider end where summers are humid. Plants reach roughly 80 cm high and 40 cm wide.
- Position and outcome: BIG can grow in sun or shade after acclimatisation, but “sun tolerant” does not mean drought tolerant. Use bright shade or morning sun in hot-dry regions and expect a large, long-flowering bed or container plant.
Dragon Wing Red
Dragon Wing Red is a Begonia interspecific F1. It develops an upright, arching growth form with pendulous red flowers and needs more room than a compact wax begonia.
- Depth, light and pretreatment: Surface sow with no cover. Light is required. No soaking or chilling is needed; if using a pellet, wet it thoroughly after placement.
- Temperature and time: Maintain 22–25°C and expect germination in 7–10 days.
- Spacing and size: Space 30–38 cm apart. Mature plants are about 30–38 cm high and 38–46 cm wide.
- Position and outcome: Suitable from sun to shade after gradual hardening, with afternoon protection in very hot areas. Professional timing is about 7–9 weeks from transplant to flowering; use it in baskets, large containers or beds.
Hula Pink, Red and White
Hula is a Begonia interspecific F1 spreading series. Its highly branched, trailing growth form fills baskets and containers and spreads through landscape beds.
- Depth, light and pretreatment: Surface sow with no cover. Light is required. No soaking or chilling is needed; if using a pellet, fully wet it.
- Temperature and time: Maintain 22–25°C and even surface moisture; check daily for emergence. Germination timing varies with conditions.
- Spacing and size: Space 30–51 cm apart according to the required coverage. Plants are approximately 15–25 cm high and spread 51–69 cm.
- Position and outcome: Hula can grow from sun to shade after hardening, but wide spacing and morning watering are important in humid regions. Professional timing is about 5–7 weeks from transplant to flowering.
Nonstop tuberous begonias
Nonstop Mix, Red, Rose Petticoat, White and Yellow are Begonia tuberhybrida F1 selections. These tuberous begonias produce large flowers on compact plants and must not inherit wax- or interspecific-begonia spacing.
- Depth, light and pretreatment: Surface sow with no cover. Light is required. Do not soak or chill; if using a pellet, wet it thoroughly after placement.
- Temperature and time: Maintain 22–23°C. Expect radicle emergence in about 7–10 days under controlled conditions.
- Spacing and size: Space 20–25 cm apart. Plants are roughly 20–25 cm high and wide.
- Position and outcome: Use partial shade or bright filtered light, with gentle morning sun where conditions are mild. Long days and good light help prevent premature tuber formation. Professional crops flower in roughly 15–18 weeks from sowing; protect finished plants from harsh midday sun and stagnant water.
Sprint Plus Maxi Mix
Sprint Plus Maxi Mix is a Begonia semperflorens F1 wax begonia. It develops a compact bedding and container growth form.
- Depth, light and pretreatment: Surface sow with no cover. Light is required. No soaking or chilling is needed; if using a pellet, fully wet it after placement.
- Temperature and time: Maintain 22–24°C and expect radicle emergence in about 6–8 days.
- Spacing and size: Space 20–25 cm apart. Plants are approximately 20–25 cm high.
- Position and outcome: Use in sun or partial shade after hardening, with afternoon protection in very hot regions. Expect compact, uniform flowering colour in beds and containers.
Planet Mix — colourful bedding and containers
Grow Planet Mix for a colourful display in pots and sheltered beds. Start the fine seed in a tray on the surface of moist seed-starting compost, without burying it. Give the tray light and steady warmth around 21–24°C; keep the surface moist with gentle watering, never waterlogged.
Allow several weeks for germination and patient early growth. Once seedlings are large enough to handle, move them carefully into individual pots, then gradually harden them before planting outside after frost. Choose morning sun or bright partial shade with protection from harsh afternoon heat and wind. As a general bedding starting point, allow about 30 cm between plants and enough room for air to circulate.
Water at the base as needed, keep drainage clear and remove damaged growth. Use the regional timing, seedling troubleshooting and safety advice in this guide. Begonias are ornamental plants, not a food crop; keep them away from pets that chew plants.
Add colour to your next container or border with Begonia Planet Mix Seeds.
Transplanting and Ongoing Care
Pot seedlings on when true leaves have formed and the roots hold the plug together. Handle by a leaf rather than the crown, and keep the crown at the original level. Harden plants gradually over 7–10 days by increasing airflow and outdoor exposure while protecting them from frost, dry wind and hard midday sun.
Plant into humus-rich, freely drained soil or a clean container mix. Keep the root zone evenly moist but never waterlogged. Water at soil level in the morning, keep wet foliage from remaining crowded overnight, and mulch established beds lightly without covering crowns. Feed modestly; high salt levels and excessive fertiliser damage fine roots and can produce soft growth. Remove damaged leaves and spent flowers where useful.
Watch for slugs and snails, aphids, thrips and mites. Botrytis, powdery mildew, bacterial leaf spotting and root rots become more damaging in crowded, damaged or persistently wet plants. Start with clean trays, remove badly affected tissue, improve airflow and drainage, and use only controls registered for the crop and problem in South Africa, exactly as their labels direct.
When to Sow and Grow in South Africa
Winter-rainfall Western Cape
Start trays under protection as winter eases, or in another mild protected window that avoids cold saturated mix. Harden plants after the worst cold and driving rain. Shelter containers from drying wind and keep them watered through the dry summer. Morning sun or bright filtered light is safer than harsh afternoon exposure.
Frost-prone interior
Sow on a warm bench or in a protected bright room from late winter into spring. Cold windowsills delay fine-seed germination. Transplant outdoors only after severe frost has passed, and keep frost protection available for young plants.
Humid coast and KZN Midlands
Choose a milder sowing window outside oppressive midsummer heat. Use sterile mix, vent trays early after emergence, water roots in the morning and use the wider end of each spacing range. Hula and BIG need enough room for foliage to dry.
Hot-dry or subtropical interior
Sow in a controlled bright position outside peak heat. Use morning sun or bright shade, mulch established beds and irrigate consistently without leaving pots in stagnant saucers. A humidity lid in direct sun can overheat and kill the seed within minutes.
Flowers and Seasonal Outcome
Seed-grown begonias are slower and finer at first than many bedding annuals, but healthy plants flower for months in suitable conditions. BabyWing, Dragon Wing, Hula and BIG give long landscape or container colour; Nonstop gives large tuberous-begonia flowers in sheltered containers and beds; Sprint Plus gives compact wax-begonia colour; Planet Mix adds colourful bedding and container displays. These are ornamental display plants rather than harvest crops. Deadheading is optional for self-cleaning types but helps keep containers tidy; remove diseased or damaged material promptly.
Troubleshooting: Why Germination or Establishment Fails
- The pellet stays hard: it was not fully wetted after placement. Re-wet gently without washing it away.
- No emergence: seed dried, was buried, the tray was colder than the module range, or a covered tray overheated in direct sun. Planet Mix may need several weeks; check its module before discarding a tray.
- Patchy emergence: moisture, light or temperature varied across the tray, or fine seed or pellets were moved by heavy watering.
- Green slime or seedlings collapse: permanent saturation, dirty trays and poor airflow encouraged algae and damping-off. Improve hygiene, drainage and ventilation.
- Seedlings stall: the mix is saline, feeding began too strongly, roots stayed cold and wet, or plants remained in tiny cells too long.
- Plants scorch: they were moved from protected propagation straight into hard sun or dry wind. Harden more gradually and use afternoon protection.
- Roots or crowns rot: drainage is poor, saucers hold water, crowns were planted too deeply or foliage stays crowded and wet.
- Plants flower poorly: light is too low, heat is excessive, watering is irregular, feeding is unbalanced or Nonstop experienced short days too early.