Longleaf Speedwell Care
Veronica longifolia
An elegant plant known for its spike-shaped blue-purple flowers that open in summer. It likes plenty of sun or light shade and moist but well-drained soil. It is not drought tolerant, so in hot climates like Izmir it needs regular summer watering.
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.
- Watering: Not needed. The plant is dormant.
- Pruning: If the dry stalks were not cut in autumn, they can be cut at ground level to make room for new shoots.
- Frost risk: Fully frost-hardy; the above-ground parts die back and the roots stay alive.
- 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: Clear the dry stalks.
- General care: The plant is preparing to wake up. For propagation by division, you may wait until late in the month.
- Watering: As rainfall decreases, start keeping the soil moist; water once a week.
- Fertilizing: If fertilizing has not been done, it can be done at the beginning of the month.
- Plant protection: Check the newly emerging fresh leaves for aphids and slugs.
- General care: New shoots from the base begin to grow rapidly. This is the best time for propagation by division from the root and for rejuvenation.
- Watering: If there is no rainfall, water every 15 days.
- Plant protection: Be careful of powdery mildew and leaf spot diseases.
- General care: Flower stalks begin to form. Tall species may need support (stakes, etc.) so they do not topple in the wind.
- Watering: If there is no rainfall, water once a week.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- Plant protection: Usually resistant to pests.
- 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: It is very sensitive to root rot; good drainage is essential.
- Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water so that the soil is wetted 10-15 cm down from the surface.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- General care: It continues to flower from the side branches.
- Pests & diseases: Check for aphids and spider mites, especially if the plant is under water stress.
- Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water so that the soil is wetted 10-15 cm down from the surface.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- General care: The plant gets through the hottest part of summer.
- Pests & diseases: Powdery mildew (white powder on the leaves) can appear in hot, humid weather. Ensure good air circulation.
- Watering: Water deeply twice a week; prefer infrequent and generous watering over small and frequent. Water so that the soil is wetted 10-15 cm down from the surface.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- General care: The plant may still be flowering.
- Pests & diseases: Check the general health of the plant.
- Watering: If there is no rainfall, water once a week.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- General care: The flowering season is ending. The plant gradually prepares for winter rest. It is a good time for new planting.
- Watering: If there is no rainfall, water every 15 days.
- Pruning: If flowering has completely ended, you can cut the plant's stalks at ground level or leave them to be cut in winter.
- General care: The above-ground parts of the plant begin to yellow and dry. The period remains suitable for new planting.
- Pests & diseases: Cleaning up fallen leaves and stems prevents diseases from carrying over to the next year.
- Pruning: If the plant has completely dried out, cut it at soil level.
- General care: The plant enters winter dormancy. Last chance for planting new young plants. Spreading a layer of compost or leaf mulch over the root zone is beneficial.
- Pruning: If they have not been cut, the dry stalks can be cut.
- General care: The plant is fully dormant.
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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