How to Grow Snapdragons in South Africa

Snapdragons (Antirrhinum majus) are cool-season flowers sold in tall cut-flower, tall garden and compact bedding forms. The seed is extremely small. Use the section linked from your product page and check whether your chosen variant is raw or pelleted.

Shared sowing method

Firm and moisten a fine seed-starting mix before sowing. Raw seed receives only a dusting of fine vermiculite, about 1–2 mm; do not bury it at ordinary seed depth. Keep 18–21 C for most types, with bright filtered light and even moisture. Transplant after two to three true leaves and avoid root-bound plugs.

Pelleted seed is handled by form: place one pellet on the surface, wet it thoroughly until the coating begins to soften, maintain even moisture and use at most a very light dusting. Follow any seed treatment or handling warning supplied with your seed.

Potomac cut-flower snapdragons

Potomac is a tall Group 4 cut-flower series for long days, strong light and warm finishing, with nights above about 16°C. Use a light seed cover and 18–21°C during germination; emergence timing varies. Stems reach about 99–152 cm and require support. Use 8–10 cm intensive cut-row spacing with netting or 15–20 cm in a home border for airflow.

Match the sowing method above to the seed you have: use the fine-seed method for loose seed or the pellet method for pellets. Do not bury pelleted seed 5 mm deep.

Do not pinch for one premium main stem. An optional pinch creates more but shorter stems.

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Rocket Mix

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Rocket Mix is a tall Group 3–4 garden and cut-flower type. Cover individual seeds lightly, aim for 18–24°C and keep the mix evenly moist; emergence timing varies with conditions. Plants reach approximately 76–91 cm high and 41–46 cm wide; space 36–46 cm in a garden. Support in exposed sites.

Shop Rocket Mix seeds: Antirrhinum (Snapdragon) Rocket Mix Seeds.

Snapshot Mixture

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Snapshot is a compact bedding snapdragon about 20–25 cm high and 25–30 cm wide. For loose seed or pellets, use the matching sowing method above. Space 15–20 cm apart. Use in borders, pots and mass bedding.

Shop Snapshot Mixture seeds: Antirrhinum (Snapdragon) Snapshot Mixture Seeds.

Twinny Formula Mix

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Twinny is a dwarf F1 with double flowers. Press onto the moist surface; no cover is required, although a light vermiculite dusting may help retain moisture. Germinate at 18–22 C; radicles appear in about 3–4 days under controlled conditions. Mature plants reach 35–40 cm high and 25–30 cm wide; space 25–30 cm apart.

Pinching is optional for more branching and adds roughly one to two weeks to crop time. Twinny suits beds and containers and can flower through light frost.

Shop Twinny Formula Mix seeds: Antirrhinum (Snapdragon) Twinny Formula F1 Mix Seeds.

Madame Butterfly Mix

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Madame Butterfly has double azalea-like blooms for borders and cutting. Cover lightly, aim for 22–24 C and expect about five days under controlled conditions. Plants reach approximately 61–76 cm high and 36–41 cm wide; space 35–40 cm apart. Support in wind and cutting rows. Pinching is not recommended.

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Regional South African timing

• Winter-rainfall Western Cape: sow the general cool-season types in late summer into autumn. For Potomac, plan finishing for longer days and nights above about 16°C, commonly spring into summer where heat and irrigation can be managed. Protect trays from heavy rain and maintain airflow.
• Frost-prone interior: start the general cool-season types in late winter under protection, or sow in autumn only with frost protection. For Potomac, establish under protection and finish after frost as days lengthen and nights rise above about 16°C.
• Humid coast and KZN Midlands: use a mild, drier window for the general cool-season types. Potomac needs long days, strong light and nights above about 16°C; Midlands frost pockets need protection. Widen spacing and keep foliage dry overnight.
• Hot-dry or subtropical interior: grow the general cool-season types in mild autumn-to-winter weather. Potomac needs long days, strong light and warm finishing nights above about 16°C, so a frost-free winter site may still be too cool or short-day for strong stems. Plan its finish for suitable spring-to-summer conditions or a controlled growing space. Afternoon protection can reduce extreme heat stress, but deep shade weakens stems and flowers.

Care, harvest and troubleshooting

Plant in sun and fertile, free-draining soil. Water at soil level and feed lightly; snapdragons are sensitive to high salts. Net tall rows. Harvest when the lower three to five florets open, or deadhead garden plants for repeat bloom.

Failure commonly comes from deep sowing, dry pellets, saturated cold mix or root-bound plugs. Maintain airflow to reduce damping-off, rust, mildew and Botrytis. Inspect for aphids and thrips. Use only locally labelled controls.