Garden Care Guide

Eastern Red Cedar Care

Juniperus virginiana

An extremely hardy and drought-tolerant tree known for its aromatic wood used in pencil making. Because it is the alternate host of cedar-apple rust, a disease that harms apple, pear and quince trees, it should not be planted near these trees.

Hardy · -30 °C / -22 °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
  • Pests & diseases: Against the risk of root rot, make sure drainage is good. Frost protection is not needed; it is very hardy.
February
  • Pruning: Before new growth begins, cut only dead, diseased or rubbing branches. Structural pruning is generally not needed.
  • General care: Flowering begins.
March
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Fertilizing: Not required, it prefers poor soils; do not overfeed.
  • 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: Suitable period for planting and transplanting. Flowering continues.
  • Pests & diseases: Check the branches and trunk for brown, fixed bumps (scale insects).
April
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Plant protection: With spring rains, check branches for orange, gelatinous galls (cedar-apple rust).
  • General care: Suitable period for planting and transplanting. Flowering continues.
May
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its 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: If you see black spots with yellow halos on the leaves (black spot), collect the diseased leaves and remove them from the garden; the disease overwinters in fallen leaves. Check the branches and trunk for brown, immobile bumps (scale insects).
June
  • Watering: In a long drought, water deeply once a month.
  • Pruning: Do shaping and hedge pruning. For a hedge or shaping, do light tidying before growth begins. Take care not to damage the needles; cut back into green branch. Heavy pruning does not produce new shoots.
  • 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.
  • Pests & diseases: If you see black spots with yellow halos on the leaves (black spot), collect the diseased leaves and remove them from the garden; the disease overwinters in fallen leaves.
July
  • Watering: In midsummer, deep watering every 15-20 days is enough. Established plants (over 2 years old) do not need watering in most years. The root zone should be wetted to a depth of 30-40 cm.
  • Plant protection: Check against the risk of spider mites.
August
  • Watering: In midsummer, deep watering every 15-20 days is enough. Established plants (over 2 years old) do not need watering in most years. The root zone should be wetted to a depth of 30-40 cm.
  • Plant protection: Continue checking for spider mites.
September
  • Watering: In a long drought, water deeply once a month. Water newly planted specimens more often than established plants during the first year; the root system is still shallow.
  • Pruning: Do the last formative pruning of the season; do not let it put out new shoots before frost.
  • 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: If you see black spots with yellow halos on the leaves (black spot), collect the diseased leaves and remove them from the garden; the disease overwinters in fallen leaves.
October
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its 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.
  • General care: Good time for planting and transplanting.
December
  • General care: Evergreen leaves continue to lose water in winter. Water thoroughly once before the soil freezes.

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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