Garden Care Guide

Guelder Rose Care

Viburnum opulus

A shrub that prefers moist, well-drained soil and full sun or light shade. It is grown for its showy white spring flowers and bright red clustered berries in autumn. The fruit can be eaten after processing (pickling, etc.).

Hardy · -25 °C / -13 °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: Not required; the plant is dormant and winter rains are sufficient.
  • Pruning: To rejuvenate the plant, old and unproductive branches (up to 1/3 of the total branches) can be cut at the base. Wait until late spring for the main pruning.
February
  • Fertilizing: At the end of the month, before new growth starts, some compost or a slow-release balanced fertilizer (e.g. NPK 10-10-10) can be applied to the soil. Do not overfeed.
  • Pruning: Remove branches damaged in winter. Wait for the main pruning.
  • General care: The plant is preparing to wake up.
March
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Fertilizing: If fertilizing has not been done, it can be done at the beginning of the month.
  • Pruning: Not done; wait for it to flower.
  • Plant protection: Check the newly emerging fresh leaves and buds very carefully for aphids. This is the period when it is most vulnerable.
  • General care: Good time for planting and transplanting.
  • Pests & diseases: Aphids are this plant's worst enemy; early action is important.
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.
  • 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.
  • Pruning: Right after flowering ends is the best time to shape the plant and control its size.
  • 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: 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.
June
  • Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water around the roots to a depth of 15-20 cm.
  • 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 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. Look for white, powdery patches on the leaves (powdery mildew). Thinning dense branches to increase airflow slows its spread.
July
  • Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water around the roots to a depth of 15-20 cm.
  • Pruning: Prune as soon as flowering ends. Next year's flower buds form over the summer; late pruning reduces flowering. Rejuvenate by removing old branches at the base; shearing the top spoils the natural form.
  • 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: Keep it in a position sheltered from midday sun; scorching at the leaf edges is a sign of burn.
  • 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 around the roots to a depth of 15-20 cm.
  • 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: The fruits turn bright red.
  • 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.
  • 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: This is the plant's most ornamental period, and its bright red fruit clusters are eye-catching. It is the best time to harvest the fruit. It is also a good month for planting new saplings.
  • Pests & diseases: 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.
  • General care: Good time for planting and transplanting.
November
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Pruning: After the leaves have completely fallen, pruning can be planned.
  • General care: Good time for planting and transplanting. Collect fallen leaves; many disease agents and pests overwinter under them.
December
  • Pruning: This is the most suitable period for pruning.
  • General care: The plant is fully dormant. Its red fruits can remain on the branches through the winter.

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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