Garden Care Guide

Crack Willow Care

Salix fragilis

A very fast-growing tree that grows naturally along waterways and likes constantly moist soil. Because its branches break very easily (hence the name 'brittle'), it can be hazardous in gardens and requires constant cleanup; it is not drought tolerant.

Hardy · -35 °C / -31 °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
  • Fertilizing: Well-rotted manure or compost can be added to the soil; do not overapply.
  • Pruning: Main pruning time. Remove hazardous, weak and dry branches. This is the best time for pollarding to reduce the size and hazard of the tree.
  • Plant protection: Apply dormant oil (mineral oil) against scale insect and aphid eggs.
  • General care: Broken branches can easily be rooted by burying them in the soil.
  • Pests & diseases: Look for signs of canker on the trunk and branches.
February
  • Fertilizing: A balanced NPK fertilizer can be applied if needed, but do not overapply.
  • Pruning: While dormant, remove dry, broken, crossing and inward-growing branches so that air and light reach the inside of the crown.
  • Plant protection: Before the buds wake up, apply a copper-based preparation against fungal diseases.
  • General care: Propagation by cuttings can continue.
  • Frost risk: Protect newly planted seedlings from severe frosts.
March
  • Watering: If the soil begins to dry, water abundantly (40-50 L/week); reduce if there is rain.
  • Plant protection: Check the new shoots for aphids.
  • General care: Rapid growth begins.
April
  • Watering: If there is no rainfall, water 1-2 times 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: It grows very fast.
  • 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: Water 2-3 times a week. The root zone should be wetted to a depth of 30-40 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: Spread a 5-7 cm layer of mulch over the root zone; it retains soil moisture and suppresses weeds. Do not pile mulch against the trunk.
  • 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. Check the undersides of the leaves for orange-brown pustules (rust).
June
  • Watering: Water deeply 3-4 times a week, early in the morning. The root zone should be wetted to a depth of 30-40 cm. Frequent shallow watering pulls the roots to the surface.
  • Pruning: Do not prune, except for branches damaged by storms.
  • 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: Be constantly on the alert for branches that break and fall.
  • 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. Check the undersides of the leaves for orange-brown pustules (rust).
July
  • Watering: Water deeply 3-4 times a week, early in the morning. The root zone should be wetted to a depth of 30-40 cm. Frequent shallow watering pulls the roots to the surface.
  • Plant protection: Continue pest control.
  • General care: Check the soil moisture constantly.
  • Pests & diseases: Water stress weakens the plant and makes it open to diseases.
August
  • Watering: Water deeply 3-4 times a week, early in the morning. The root zone should be wetted to a depth of 30-40 cm. Frequent shallow watering pulls the roots to the surface.
  • Plant protection: Continue pest control.
  • General care: Maintain the mulch to keep the roots cool.
  • Pests & diseases: Keep watching for signs of water stress.
September
  • Watering: Water 2-3 times a week. The root zone should be wetted to a depth of 30-40 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: Preparing for dormancy.
  • Pests & diseases: Check the undersides of the leaves for orange-brown pustules (rust).
October
  • Watering: If there is no rainfall, water 1-2 times a week.
  • General care: The leaves turn yellow. Clear the fallen leaves and broken branches.
November
  • Watering: If the winter rains start, stop watering completely.
  • Plant protection: Apply a copper-based preparation after leaf fall to prevent diseases.
  • General care: Collect fallen leaves; many disease agents and pests overwinter under leaves.
  • Frost risk: Protect newly planted seedlings during the first winter.
December
  • Pruning: The main pruning period can begin.

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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