Getting it to bloom

Why won't my Tree heath bloom? (and how to make it flower)

Also called Tree heath, Briar heath, Bruyère (Erica arborea).

More about tree heath

About Tree heath

Erica arborea · also called Tree heath, Briar heath · flowering

The largest European heath, forming a substantial upright shrub or small tree with fine, needle-like dark green foliage and dense, sweetly honey-scented white flower spikes in late winter and spring. A dramatic structural plant for mild gardens and coastal sites. Rated RHS H4; requires acidic, sharply drained soil and full sun. Its rootstock is the traditional source of briar pipe wood.

Plant type: flowering

Watch for — Leggy growth without pruning: Can become very open and ungainly if not pruned. Trim lightly after flowering in late spring to maintain shape and encourage bushy regrowth. Erica arborea tolerates harder pruning than most heathers but avoid cutting back into very old, bare wood.

The reasons tree heath isn't blooming

Almost every non-blooming tree heath 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 tree heath 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 tree heath to flower

Maximise sun. Give tree heath 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 tree heath and get the feeding right with the tree heath 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

Tree heath 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 tree heath care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Tree heath blooming — frequently asked questions

Why won't my tree heath flower?

Tree heath 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 tree heath bloom?

Give tree heath 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 tree heath normally bloom?