Getting it to bloom

Why won't my Common Cow-wheat bloom? (and how to make it flower)

Also called Common Cow-wheat, Cow Wheat (Melampyrum pratense).

More about common cow-wheat

About Common Cow-wheat

Melampyrum pratense · also called Common Cow-wheat, Cow Wheat · flowering

Melampyrum pratense is a native European annual hemiparasite of woodland edges, heaths, and acid moorland, drawing supplementary nutrition from the roots of neighbouring woody plants via haustoria. It thrives in well-drained, nutrient-poor, acidic soils in partial to full shade and is notoriously difficult to establish outside its natural habitat because seedlings must locate a suitable host root before spring growth can begin. The most important care fact is that no conventional fertiliser should ever be applied — excess nutrients collapse the plant's competitive strategy and prevent establishment. The plant contains iridoid glycosides that can cause digestive upset; it is classified as mildly toxic and should be kept away from pets.

Plant type: flowering

The reasons common cow-wheat isn't blooming

Almost every non-blooming common cow-wheat 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 common cow-wheat 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 common cow-wheat to flower

Maximise sun. Give common cow-wheat 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 common cow-wheat and get the feeding right with the common cow-wheat 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

Common Cow-wheat 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 common cow-wheat care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Common Cow-wheat blooming — frequently asked questions

Why won't my common cow-wheat flower?

Common Cow-wheat 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 common cow-wheat bloom?

Give common cow-wheat 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 common cow-wheat normally bloom?