Getting it to bloom

Why won't my Purple mountain heather bloom? (and how to make it flower)

Also called Purple mountain heather, Blue mountain heather (Phyllodoce caerulea).

More about purple mountain heather

About Purple mountain heather

Phyllodoce caerulea · also called Purple mountain heather, Blue mountain heather · flowering

Purple mountain heather is a low-growing ericaceous subshrub native to circumboreal alpine and arctic zones, prized for its dense clusters of urn-shaped purple to lilac-pink flowers in late spring to early summer. With needle-like evergreen leaves and a cushion habit, it suits acidic, cool rock gardens and is exceptional in Scottish Highlands-type climates.

Plant type: flowering

The reasons purple mountain heather isn't blooming

Almost every non-blooming purple mountain heather 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 purple mountain heather 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 purple mountain heather to flower

Maximise sun. Give purple mountain heather 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 purple mountain heather and get the feeding right with the purple mountain heather 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

Purple mountain heather 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 purple mountain heather care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Purple mountain heather blooming — frequently asked questions

Why won't my purple mountain heather flower?

Purple mountain heather 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 purple mountain heather bloom?

Give purple mountain heather 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 purple mountain heather normally bloom?