Japanese Honeysuckle Care
Lonicera japonica
A fast-growing, hardy and fragrant climber; it can be aggressive if not kept under control. It tolerates conditions from full sun to partial shade and performs best in well-drained soils.
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; only if the soil is bone dry, a very small amount, 5 L/m²; reduce if it rains.
- Pruning: If the plant has grown very large, this is the ideal time for a hard renovation prune.
- Plant protection: Application of dormant oil (mineral oil) against scale insects and aphid eggs.
- General care: Check supports.
- Pests & diseases: Look for scale insects on the trunk.
- Frost risk: Generally hardy.
February
- Watering: Not required; only during prolonged drought, 5 L/m²; reduce if it rains.
- Pruning: Hard pruning can be continued. Remove dry and diseased branches.
- Plant protection: You can repeat the dormant oil application.
- General care: Clear fallen leaves.
- Pests & diseases: Check for overwintering pests.
- Frost risk: Protect young plants.
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. Because yield and fruit quality depend on nutrient balance, having a soil analysis done is especially useful for this plant.
- Pruning: Finish the last pruning before the new shoots wake up.
- Plant protection: Start checking the new shoots for aphids.
- General care: Good time for planting and transplanting.
- Pests & diseases: Watch for the first aphids. Late frosts can damage new shoots.
April
- Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
- Fertilizing: To encourage flowering, a potassium-heavy liquid fertilizer (drip/foliar) can be given; do not overapply.
- Pruning: Do not do it during the flowering period.
- 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: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
- Fertilizing: During the flowering period, potassium-heavy feeding can be continued.
- Pruning: Do not do it.
- 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 begins.
- 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. If you see black spots with yellow rings on the leaves (black spot), collect the diseased leaves and remove them from the garden; the disease overwinters in fallen leaves.
June
- Watering: In a long drought, water deeply once a month.
- Fertilizing: At the start of the month, a light liquid fertilizer may be applied.
- Pruning: After the main flowering, prune to control and shape the plant. Pruning is very important for this plant.
- 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. If you see black spots with yellow rings 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 area around the roots should be wetted to a depth of 20-30 cm.
- Fertilizing: Do not apply fertilizer in extreme temperatures.
- Pruning: Light pruning for control can be continued.
- Plant protection: The risk of spider mites is high; use a miticide if necessary.
- General care: Flowering continues.
- Pests & diseases: Drought stress weakens the plant against pests; water regularly.
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 area around the roots should be wetted to a depth of 20-30 cm.
- Fertilizing: Do not fertilize.
- Pruning: Cut only shoots growing out of control.
- Plant protection: Keep up checks for spider mites and other sucking insects.
- General care: Flowering continues.
- Pests & diseases: Watch for fungal diseases related to high temperature and humidity.
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.
- Fertilizing: To prepare for winter, apply a low-nitrogen fertilizer rich in phosphorus and potassium (e.g. 5-10-15 NPK) (15-20 g/m²); do not overapply.
- Pruning: Do a final tidy-up pruning.
- 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.
October
- Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
- Pruning: Prune as soon as flowering ends. Next year's flower buds form over the summer; late pruning reduces flowering. Prune right after flowering; late cutting reduces the next year's flowers. Species with invasive growth need root restriction and regular cutting. Crowded branches are thinned.
- Plant protection: Do a general check going into winter.
- General care: Good time for planting and transplanting.
- Pests & diseases: Rotting plant debris can be a source of disease.
November
- Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
- Pruning: Remove broken and diseased branches.
- Plant protection: If necessary, apply a protective spray with a copper fungicide.
- General care: Good time for planting and transplanting.
- Pests & diseases: Check the trunk for overwintering pests.
- Frost risk: Mulching protects the roots.
December
- Pruning: Prepare for winter pruning or start it.
- Plant protection: None, observation only.
- General care: Check the mulch layer.
- Pests & diseases: Carry out a general condition check.
- Frost risk: Generally hardy.
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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