Getting it to bloom

Why won't my Yellow Whitlowgrass bloom? (and how to make it flower)

Also called Yellow Whitlowgrass, Yellow Whitlow Grass, Aizoon Whitlowgrass (Draba aizoides).

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.

Plant type: flowering

Watch for — Aphids on flower stems: Colonies of aphids sometimes attack the soft flower stems and buds in early spring. Remove by hand or with a gentle jet of water. Avoid chemical sprays on the tight cushion, which retains moisture.

The reasons yellow whitlowgrass isn't blooming

Almost every non-blooming yellow whitlowgrass traces back to one of these, roughly in order of how common they are:

Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
Too much nitrogen feed, driving lush foliage at the expense of flowers (very common with general or lawn feeds).
The plant has not been deadheaded, so it stops flowering once it sets seed.
Irregular watering — drought or waterlogging at the budding stage makes buds abort.
It is still too young or was checked by a transplant and is rebuilding before flowering.

Feeding yellow whitlowgrass a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.

The fix — how to get yellow whitlowgrass to flower

Maximise sun. Give yellow whitlowgrass the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
Deadhead regularly. Remove spent flowers often to keep it producing more rather than stopping to set seed.
Water consistently. Keep moisture even through budding and flowering — drought-then-flood swings make buds drop.

Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for yellow whitlowgrass and get the feeding right with the yellow whitlowgrass fertilising schedule — the wrong feed (too much nitrogen) is one of the most common silent reasons a healthy plant makes leaves instead of flowers.

Bloom season and what to expect

Yellow Whitlowgrass flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.

Post-bloom care so it flowers again

Deadhead, keep feeding lightly, and many will rebloom; collect seed from the best plants at the end of the season if you want to grow them again.

For everything else this plant needs day to day, see the full yellow whitlowgrass care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Yellow Whitlowgrass blooming — frequently asked questions

Why won't my yellow whitlowgrass flower?

Yellow Whitlowgrass blooms on the season's growth given enough sun, warmth and the right feed — there is no cold or photoperiod trick, just good growing conditions and a bloom-leaning feed. The most common reason it is not happening: Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.

How do I make yellow whitlowgrass bloom?

Give yellow whitlowgrass the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.

When does yellow whitlowgrass normally bloom?