Getting it to bloom

Why won't my Brunnera macrophylla bloom? (and how to make it flower)

Also called Siberian bugloss, Large-leaved brunnera (Brunnera macrophylla).

More about brunnera macrophylla

About Brunnera macrophylla

Brunnera macrophylla · also called Siberian bugloss, Large-leaved brunnera · flowering

The species Siberian bugloss, a tough, clump-forming shade perennial with large, plain green heart-shaped leaves and clouds of tiny blue forget-me-not flowers in mid to late spring. An easygoing woodland groundcover, the green-leaved species is more sun- and drought-tolerant than its silvered cultivars and self-seeds gently to colonise moist, shaded ground.

Plant type: flowering

Watch for — Self-seeding spread: The species self-seeds and can naturalise. Remove spent flower stems if you want to limit seedlings; seedlings come green, not variegated.

The reasons brunnera macrophylla isn't blooming

Almost every non-blooming brunnera macrophylla 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 brunnera macrophylla 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 brunnera macrophylla to flower

Maximise sun. Give brunnera macrophylla 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 brunnera macrophylla and get the feeding right with the brunnera macrophylla 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

Brunnera macrophylla 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 brunnera macrophylla care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Brunnera macrophylla blooming — frequently asked questions

Why won't my brunnera macrophylla flower?

Brunnera macrophylla 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 brunnera macrophylla bloom?

Give brunnera macrophylla 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 brunnera macrophylla normally bloom?