Repotting guide

When & how to repot Yellow Whitlowgrass (Draba aizoides)

Also called Yellow Whitlowgrass, Yellow Whitlow Grass, Aizoon Whitlowgrass.

More about yellow whitlowgrass

About Yellow Whitlowgrass

Draba aizoides · also called Yellow Whitlowgrass, Yellow Whitlow Grass · flowering

Yellow Whitlowgrass is a diminutive alpine perennial native to rocky European mountains, forming tight cushions of stiff, bristle-margined leaves. Bright yellow, four-petalled flowers on short stems appear very early in spring, often among the first alpines to bloom. It excels in troughs, rock crevices, and raised beds with excellent drainage.

Mature size: 8–12 cm tall in flower; 15–20 cm wide

How to tell yellow whitlowgrass needs repotting

Repotting on a calendar is less reliable than reading the plant. For yellow whitlowgrass, 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 yellow whitlowgrass

Every 2–3 years, into bone-dry mix. Yellow Whitlowgrass's growth habit — compact, cushion-forming evergreen alpine perennial with rigid, bristle-edged linear leaves in tight rosettes. very slow-growing; 5–8 cm tall at rest. — sets the pace. Yellow Whitlowgrass is a diminutive alpine perennial native to rocky European mountains, forming tight cushions of stiff, bristle-margined leaves. Bright yellow, four-petalled flowers on short stems appear very early in spring, often among the first alpines to bloom. It excels in troughs, rock crevices, and raised beds with excellent drainage.

What size pot to step yellow whitlowgrass up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Yellow Whitlowgrass 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 yellow whitlowgrass

Spring or summer, while yellow whitlowgrass 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 yellow whitlowgrass

Repot dry. Do not water yellow whitlowgrass 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 sharply drained, gritty or rocky 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 yellow whitlowgrass 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 yellow whitlowgrass 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 yellow whitlowgrass

Yellow Whitlowgrass wants sharply drained, gritty or rocky alpine mix. A mix of 50–60% coarse horticultural grit or crushed stone with loam and leaf mould suits well. Neutral to slightly alkaline pH (6.8–7.5) preferred. The species naturally grows in limestone screes and rock crevices. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting yellow whitlowgrass — frequently asked questions

How often should you repot yellow whitlowgrass?

Every 2–3 years, into bone-dry mix for yellow whitlowgrass. Repot yellow whitlowgrass every 2–3 years into a snug pot of sharply drained, gritty or rocky 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 yellow whitlowgrass need?

When is the best time of year to repot yellow whitlowgrass?

Should you water yellow whitlowgrass after repotting?

No — not straight away. Repot yellow whitlowgrass 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 yellow whitlowgrass after repotting?

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