Centaurea dealbata Care
Centaurea dealbata
A silver-leaved, drought-tolerant perennial native to the Caucasus and Northeastern Turkey. It loves full sun and well-drained soils; pruning after the main flowering keeps the plant neater and sometimes makes it flower again.
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 required; winter precipitation is sufficient. The plant is dormant.
- Pruning: Cut all the dry stalks and leaves left over from the previous season at ground level.
- General care: A suitable time for propagation by root division and rejuvenation.
- Pests & diseases: Make sure drainage is good against the risk of root rot.
- Pruning: Continue removing dry and old leaves.
- General care: Still a good time for root division (propagation).
- Watering: Keep the soil moist; if there is no rain, water every 15 days (15 L/m²).
- Fertilizing: At the start of the month, mix a very small amount of compost or slow-release balanced NPK fertilizer into the soil (do not overapply).
- Plant protection: Check the newly emerging shoots and buds for aphids.
- General care: Clear weeds.
- Pests & diseases: Aphids are the most common pest.
- Watering: Once a week (15-20 L/m²); keep the soil constantly moist.
- Pruning: Not needed. Flowering begins.
- Plant protection: Continue controlling aphids.
- General care: Tall flower stalks may tend to lodge; support them if necessary.
- Watering: Continue regular watering once a week.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- Plant protection: Continue pest control.
- General care: The plant is in full flowering.
- Pests & diseases: Watch for powdery mildew (white powder on the leaves).
- Watering: In a long drought, water deeply once a month.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- General care: After pruning, the plant will quickly produce new, fresh leaves.
- Pests & diseases: Pruning helps control fungal diseases such as powdery mildew.
- 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 so that the soil is wetted to a depth of 10-15 cm from the surface.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- General care: The plant looks healthier with fresh leaves.
- 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 so that the soil is wetted to a depth of 10-15 cm from the surface.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- General care: Sometimes a second, weaker flowering may appear after summer pruning.
- Watering: In a long drought, water deeply once a month.
- Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
- General care: The best time of year to plant new seedlings or to propagate an existing plant by division. The fresh leaves that emerge after summer pruning look lovely this month.
- Watering: Autumn rainfall is usually sufficient; if the weather turns dry, water every 15 days.
- Pruning: Remove the last flower stalks.
- General care: The plant forms its leaf rosette for winter.
- Watering: Not needed; rainfall is sufficient.
- Pruning: Clean the plant one last time before winter, cutting off all dead stems.
- General care: It enters winter dormancy.
- General care: Dormancy period.
- Pests & diseases: Heavy soils that stay wet in winter can cause root rot.
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.
Want reminders for every plant in your garden? Our garden-care app with monthly task lists and frost alerts is currently available in Turkish; the English version is on the way.
Browse all plant guides