Why Are My Puschkinia Leaves Curling?

Waterlogging

Waterlogging is the most significant cause of puschkinia failure in UK gardens. Puschkinia is native to the rocky mountain slopes of the Middle East and Caucasus, where the soil is thin, gritty, and fast-draining, and where summer is dry and hot. In persistently wet, heavy UK clay, the small bulbs deteriorate rapidly. The narrow leaves curl, yellow, and collapse as the rotting bulb base fails to support normal growth. Puschkinia is considerably more sensitive to waterlogging than many other spring bulbs and is best treated as a bulb requiring excellent drainage rather than a general border plant.

What to do

• Plant puschkinia exclusively in sharply drained, gritty soil. Rock gardens, scree beds, raised beds, and well-drained alpine troughs are the most appropriate positions in UK gardens.
• In standard border soil, add very generous quantities of coarse grit to at least double the volume of soil in the planting area, creating a gritty mix that drains freely even in winter.
• A position that faces south or west, where excess moisture drains away quickly and the soil warms and dries in spring, is ideal.
• Do not plant puschkinia in low-lying positions, heavy unimproved clay, or any position where water collects in winter.

Bulb rot

Bulb rot is a very common cause of puschkinia failure. The small bulbs deteriorate rapidly once fungal rot takes hold, as they have limited reserves. The characteristic signs are soft, brown bulb scales and a musty or unpleasant smell when the bulb is cut. Rotting puschkinia bulbs produce curling, yellowing leaves in spring or fail to emerge at all. Bulb rot is most likely in bulbs planted in wet or poorly drained soil, stored damp before planting, or purchased in poor condition.

What to do

• Purchase firm, plump puschkinia bulbs from a reputable supplier and plant promptly on receipt in autumn. Inspect all bulbs before planting and discard any that are soft, shrivelled, or show brown discolouration.
• Dust bulbs with sulphur powder before planting to reduce fungal rot risk. This is particularly worthwhile in any soil that retains some moisture.
• Add a layer of coarse grit directly around and below the bulbs when planting, creating a freely draining micro-environment around the bulb even if the surrounding soil drains more slowly.

Vine weevil

Vine weevil larvae attack puschkinia bulbs from late summer through winter. Because puschkinia bulbs are very small, even a single vine weevil larva can destroy a bulb. Container-grown puschkinia is particularly vulnerable, as larvae are concentrated in a small volume of compost. In spring, the damaged bulbs produce curling, wilting leaves or fail to emerge. The adult vine weevil leaves irregular notches along leaf margins in summer.

What to do

• Apply biological nematode control (Steinernema kraussei) to containers and susceptible areas in late summer when soil temperatures are above 5 degrees Celsius.
• Inspect compost for c-shaped cream larvae when emptying containers after the season and destroy any found.
• Use a vine weevil killer drench in containers where the pest is a known problem, applying in early autumn before larvae reach damaging size.

Squirrel and mouse damage

Squirrels and mice will dig up puschkinia bulbs, though the small size makes them a less preferred target than larger, more energy-rich bulbs such as tulips and narcissus. In gardens with persistent rodent pressure, however, the small bulbs can still be significantly depleted after planting. Partially excavated and replaced bulbs may produce curling leaves in spring as they are not correctly orientated or have been exposed to freezing temperatures.

What to do

• Cover newly planted areas with chicken wire mesh pegged flat to the surface until growth emerges in late winter or early spring.
• The gritty, sharply drained soil that puschkinia prefers in raised beds and rock gardens provides some natural protection, as it is harder for rodents to excavate than soft border soil.
• Plant at the deeper end of the recommended depth range to make the bulbs harder for rodents to detect and reach.

Overcrowding

Puschkinia increases steadily by producing small offset bulbs, and over several years an established planting can become congested. Overcrowded plants produce smaller, weaker, more curling leaves as individual bulbs compete for the limited water and nutrients in their immediate environment. Flowering declines as overcrowding intensifies. In rock gardens and troughs, overcrowding can become significant within five to seven years.

What to do

• Divide congested puschkinia clumps every five to six years, in late summer or early autumn when the bulbs are dormant. Lift, separate individual bulbs, and replant at 5 to 8 cm apart in freshly improved gritty soil.
• In containers and alpine troughs, refresh the growing medium and divide bulbs every three to four years to maintain vigour.
• The small size of puschkinia offset bulbs means some should be discarded or given away when dividing, rather than replanting the full number at tighter spacing.

Frequently asked questions

Why are my puschkinia leaves curling?

Puschkinia leaves curl most often from waterlogging or bulb rot. The narrow, strap-like leaves curl and yellow when the small bulbs are damaged by wet, poorly drained soil conditions, or when fungal rot has taken hold in the bulb scales. Puschkinia is native to regions with dry, rocky, well-drained soils and is poorly adapted to the persistently wet conditions of heavy UK clay, which is the most common cause of failure.

What does puschkinia look like?

Puschkinia scilloides (striped squill) produces small, pale blue-white flower spikes in March and April, each flower having a distinctive pale blue stripe along each petal that gives the plant its common name. The flowers are similar in overall form to scilla and chionodoxa but paler and more delicate in colouring. The paired strap-like leaves emerge with the flowers. Puschkinia is a small, dainty plant reaching only 10 to 20 cm tall, best appreciated in drifts at close range rather than as an architectural statement.

When should I plant puschkinia bulbs?

Plant puschkinia bulbs in autumn from September to November at a depth of 5 to 8 cm in well-drained, gritty soil. They are ideally suited to the rock garden, scree bed, raised bed, or the front of a well-drained border, where their small stature and early flowering season can be fully appreciated without being obscured by larger plants. Plant in bold groups of at least 15 to 20 bulbs. In the open border, puschkinia should be in a position that dries out in summer.

How do I grow puschkinia successfully?

The key to growing puschkinia successfully is sharp drainage and a summer dry period. In the wild, puschkinia grows in rocky mountain terrain in the Middle East and Caucasus where the soil is thin, gritty, and bakes dry in summer. In UK gardens, replicate this by planting in a raised bed, rock garden, or scree with substantial added grit. A south or west-facing slope that sheds winter rain and dries quickly after spring flowering is ideal. Avoid heavy clay and any position that retains moisture in summer.