Repotting guide

When & how to repot Wulfen's Alyssum (Alyssum wulfenianum)

Also called Wulfen's Alyssum, Wulfenia Alyssum.

More about wulfen's alyssum

About Wulfen's Alyssum

Alyssum wulfenianum · also called Wulfen's Alyssum, Wulfenia Alyssum · flowering

Wulfen's Alyssum is a rare, tufted alpine perennial from the eastern Alps and Dinaric mountains, forming a tight silver-grey cushion. It bears dense clusters of golden-yellow flowers in late spring, releasing a light honey fragrance. A choice plant for specialist rock gardens, alpine troughs, and scree beds, it demands exceptional drainage and full sun.

Mature size: 5–10 cm tall, 15–25 cm spread

Watch for — Winter wet rot: The most serious risk. Excess moisture in winter will rot the crown and roots rapidly. Grow in an alpine house or under a glass pane from autumn to spring, or site in a raised scree bed with perfect drainage.

How to tell wulfen's alyssum needs repotting

Repotting on a calendar is less reliable than reading the plant. For wulfen's alyssum, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot wulfen's alyssum

Every 2–3 years, into bone-dry mix. Wulfen's Alyssum's growth habit — tight cushion-forming perennial subshrub — sets the pace. Wulfen's Alyssum is a rare, tufted alpine perennial from the eastern Alps and Dinaric mountains, forming a tight silver-grey cushion. It bears dense clusters of golden-yellow flowers in late spring, releasing a light honey fragrance. A choice plant for specialist rock gardens, alpine troughs, and scree beds, it demands exceptional drainage and full sun.

What size pot to step wulfen's alyssum up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Wulfen's Alyssum stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot wulfen's alyssum

Spring or summer, while wulfen's alyssum is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting wulfen's alyssum

Repot dry. Do not water wulfen's alyssum for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty very gritty, sharply drained, nutrient-poor alpine mix ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set wulfen's alyssum at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep wulfen's alyssum completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for wulfen's alyssum

Wulfen's Alyssum wants very gritty, sharply drained, nutrient-poor alpine mix. Mix 50–60% coarse limestone grit with lean loam. Alkaline to neutral pH (7.0–8.0) is preferred, reflecting its limestone mountain origins. Avoid any moisture-retentive or peat-rich media. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting wulfen's alyssum — frequently asked questions

How often should you repot wulfen's alyssum?

Every 2–3 years, into bone-dry mix for wulfen's alyssum. Repot wulfen's alyssum every 2–3 years into a snug pot of very gritty, sharply drained, nutrient-poor alpine mix, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does wulfen's alyssum need?

When is the best time of year to repot wulfen's alyssum?

Should you water wulfen's alyssum after repotting?

No — not straight away. Repot wulfen's alyssum into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise wulfen's alyssum after repotting?

Not immediately. Wait about 3 weeks after repotting wulfen's alyssum. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.