Garden Care Guide

Snapdragon Care

Antirrhinum majus

A popular, colorful cut flower of spring and early summer. It loves cool weather, performs best in full sun and well-drained, rich soil, and is very susceptible to rust.

Half-hardy · -8 °C / 18 °F

Monthly care calendar

Timings are for a temperate Northern Hemisphere climate. In warmer areas tasks start earlier, in colder areas later; in the Southern Hemisphere shift them by six months.

January
  • Watering: Winter precipitation is generally sufficient; during prolonged drought, keep the soil lightly moist.
  • Pruning: Once the seedlings reach 10-15 cm, pinch off their tips to encourage branching.
  • Plant protection: Check for snails and slugs.
  • General care: Clear weeds.
  • Pests & diseases: Make sure drainage is good against the risk of root rot.
  • Frost risk: In hard and prolonged frosts, cover the root zone with mulch or dry leaves; also protect young plants. It is damaged below about -8 °C.
February
  • Watering: Winter precipitation is generally sufficient.
  • Pruning: Once the seedlings reach 10-15 cm, pinch off their tips.
  • Plant protection: Check for snails.
  • General care: Pinching produces more flower stalks.
  • Pests & diseases: Start checking the underside of the plants for rust.
  • Frost risk: In hard and prolonged frosts, cover the root zone with mulch or dry leaves; also protect young plants. It is damaged below about -8 °C.
March
  • Watering: Keep the soil constantly moist (10-15 L/m² per week); reduce if there is rain.
  • Fertilizing: Every 2-3 weeks, apply a balanced liquid fertilizer (e.g., NPK 20-20-20); do not overfeed, and consult an agronomist.
  • Pruning: Encourage new flowering by cutting faded flower clusters at the base.
  • Plant protection: Check the undersides of the leaves for rust (orange spots) (Mancozeb, Propineb); consult a licensed plant-protection supplier or an agronomist.
  • General care: Support tall varieties (staking). Harvest as cut flowers.
  • Pests & diseases: Rust is the biggest threat; try not to wet the leaves.
April
  • Watering: If there is no rainfall, water every 15 days. Water newly planted plants more often than established plants during the first year; the root system is still shallow.
  • Fertilizing: Give liquid fertilizer once a month.
  • Pruning: Cut faded flowers regularly.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Good time for planting and transplanting.
  • Pests & diseases: Look for aphids (green or black clusters of small insects) on fresh shoot tips. If there are only a few, you can knock them off with a strong jet of water.
May
  • Watering: If there is no rainfall, water once a week.
  • Fertilizing: Give liquid fertilizer once a month.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering. Remove spent flower spikes at the base; if left, the plant goes to seed and flowering stops.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Flowering begins. Spread a 5-7 cm layer of mulch over the root zone. It conserves soil moisture and suppresses weeds. Keep the mulch away from the stem.
  • Pests & diseases: Check the undersides of the leaves for orange-brown pustules (rust). Check the fresh shoot tips for aphids (small clusters of green or black insects). If there are few, you can knock them off with a strong spray of water.
June
  • Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water so that the soil is wetted 10-15 cm down from the surface.
  • Fertilizing: Give liquid fertilizer once a month.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Flowering continues.
  • Pests & diseases: Check the undersides of the leaves for orange-brown pustules (rust). Look for white, powdery spots on the leaves (powdery mildew). Thinning dense branches to increase airflow slows its spread. Check the fresh shoot tips for aphids (small clusters of green or black insects). If there are few, you can knock them off with a strong spray of water.
July
  • Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water so that the soil is wetted 10-15 cm down from the surface.
  • Fertilizing: Give liquid fertilizer once a month.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Flowering continues.
  • Pests & diseases: Look for white, powdery spots on the leaves (powdery mildew). Thinning dense branches to increase airflow slows its spread.
August
  • Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water so that the soil is wetted 10-15 cm down from the surface.
  • Fertilizing: Give liquid fertilizer once a month.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Flowering continues.
  • Pests & diseases: Look for white, powdery spots on the leaves (powdery mildew). Thinning dense branches to increase airflow slows its spread.
September
  • Watering: If there is no rainfall, water once a week.
  • Fertilizing: Make this month's feeding the last of the season; afterward, the plant needs to prepare for winter.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Flowering continues.
  • Pests & diseases: Check the undersides of the leaves for orange-brown pustules (rust). Look for white, powdery spots on the leaves (powdery mildew). Thinning dense branches to increase airflow slows its spread.
October
  • Watering: If there is no rainfall, water every 15 days. Water newly planted plants more often than established plants during the first year; the root system is still shallow.
  • Plant protection: Snails can eat young seedlings.
  • General care: Suitable period for planting and transplanting. Lifted at the end of the season and replaced through seasonal rotation.
  • Pests & diseases: Avoid overwatering, which leads to root rot.
November
  • Watering: Autumn rains are generally sufficient. Seedlings are established.
  • Plant protection: Keep checking for snails.
  • General care: Seedlings develop their root systems for winter.
  • Pests & diseases: Watch out for root rot.
  • Frost risk: Toward the end of the month, there may be a slight risk of frost, but the plant is usually hardy.
December
  • Watering: Winter precipitation is generally sufficient.
  • Plant protection: Check for snails.
  • General care: The plant develops slowly throughout the winter.
  • Pests & diseases: Make sure drainage is not blocked.
  • Frost risk: In hard and prolonged frosts, cover the root zone with mulch or dry leaves; also protect young plants. It is damaged below about -8 °C.

The care advice on this page is general and for information only; it is not professional advice. Plant age, soil and your garden’s microclimate can change the outcome. Plant protection products are mentioned only as general information; they are regulated, and the choice, dose and timing must be decided by a qualified professional under local rules. Consult a landscape architect or agronomist before applying.

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