Garden Care Guide

Lilac Care

Syringa vulgaris

For best flowering it likes plenty of sun and well-drained, neutral to slightly alkaline soils. It needs winter chilling to form flower buds, so in very mild climates such as Izmir, flowering may not be guaranteed every year.

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
  • Watering: Not required; the plant is dormant.
  • Pruning: Light pruning can be done only to remove dead, diseased or rubbing branches. It is not the time for main pruning.
  • Plant protection: Dormant oil can be applied against scale insects or other overwintering pests.
  • General care: Basal shoots (suckers) coming from the root can be removed.
  • Pests & diseases: Check the trunks for pests such as wood borers.
  • Frost risk: Fully frost-hardy; in fact it needs winter cold to flower.
February
  • Fertilizing: At the end of the month, before buds swell, some compost or a phosphorus-rich (bloom-promoting) fertilizer can be applied to the soil. Avoid excess nitrogen fertilizer. Do not overfeed.
  • General care: Continue removing basal shoots.
  • Pests & diseases: Observe the waking buds.
March
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Fertilizing: Apply a balanced fertilizer or well-rotted organic fertilizer once when it wakes from dormancy.
  • Pruning: Not done. The flower buds swell during this period.
  • Plant protection: Check the newly emerging leaves for aphids or slugs.
  • General care: Good time for planting and transplanting.
  • Pests & diseases: Check whether there are spots or holes on the leaves.
April
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Pruning: Absolutely not done until flowering ends.
  • Plant protection: Be careful of signs of powdery mildew (white powder on the leaves), especially in humid weather. Apply a fungicide if necessary.
  • General care: Suitable period for planting and transplanting. Flowering begins.
  • Pests & diseases: Powdery mildew is its most common problem; good air circulation is important.
May
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Pruning: Right after flowering ends is the MOST CRITICAL time for pruning. Cut spent flower clusters just above the next shoot. Shape the plant and remove weak branches. If you are late, you will have pruned off next year's flowers.
  • 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: 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 undersides of the leaves for orange-brown pustules (rust).
June
  • Watering: In a long drought, water deeply once a month.
  • Pruning: DO NOT PRUNE DURING THIS PERIOD UNDER ANY CIRCUMSTANCES. Next year's flower buds are forming.
  • 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: 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 undersides of the leaves for orange-brown pustules (rust).
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. Water the area 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. Prune right after flowering ends. Lilac forms next year's flowers on the previous year's growth; late pruning leaves it without flowers. Neglected plants can be cut hard during the frost period.
  • Plant protection: Keep watching for powdery mildew and other leaf diseases (spotting, etc.).
  • General care: Take care that the plant does not become stressed in extreme temperatures.
  • Pests & diseases: Check for pests such as aphids or 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. Water the area around the roots to a depth of 15-20 cm.
  • Plant protection: The powdery mildew problem may continue, but since it is the end of the season, spraying can be avoided if it is not urgent.
  • General care: Continue removing basal shoots.
  • Pests & diseases: Check the general health of the plant.
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.
  • 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 undersides of the leaves for orange-brown pustules (rust).
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.
  • Pests & diseases: Clearing fallen leaves is the most effective way to prevent powdery mildew from carrying over to next year.
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, you can cut only broken, dead or clearly diseased branches.
  • General care: Good time for planting and transplanting. Collect fallen leaves; many disease agents and pests overwinter under them.
December
  • Pruning: In winter, only light pruning is done, for cleanup purposes.
  • Plant protection: A dormant oil application plan can be made if needed.
  • General care: The plant is fully dormant.
  • Pests & diseases: Check the trunks.

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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