Getting it to bloom

Why won't my Astilbe chinensis 'Pumila' bloom? (and how to make it flower)

Also called Dwarf Chinese astilbe, Pumila astilbe (Astilbe chinensis 'Pumila').

More about astilbe chinensis 'pumila'

About Astilbe chinensis 'Pumila'

Astilbe chinensis 'Pumila' · also called Dwarf Chinese astilbe, Pumila astilbe · flowering

Astilbe chinensis 'Pumila' is a low, spreading dwarf astilbe valued for late-summer spikes of fluffy mauve-pink flowers over a dense carpet of bronze-tinted, ferny foliage. More drought- and sun-tolerant than most astilbes, it makes excellent weed-smothering ground cover for moist edges and part shade, and its rusty seedheads stand through winter.

Plant type: flowering

Watch for — Poor flowering: Sparse plumes usually mean too much shade, too dry, or congested clumps. Improve moisture and fertility, give some light, and divide every few years to rejuvenate.

The reasons astilbe chinensis 'pumila' isn't blooming

Almost every non-blooming astilbe chinensis 'pumila' 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 astilbe chinensis 'pumila' 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 astilbe chinensis 'pumila' to flower

Maximise sun. Give astilbe chinensis 'pumila' 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 astilbe chinensis 'pumila' and get the feeding right with the astilbe chinensis 'pumila' 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

Astilbe chinensis 'Pumila' 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 astilbe chinensis 'pumila' care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Astilbe chinensis 'Pumila' blooming — frequently asked questions

Why won't my astilbe chinensis 'pumila' flower?

Astilbe chinensis 'Pumila' 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 astilbe chinensis 'pumila' bloom?

Give astilbe chinensis 'pumila' 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 astilbe chinensis 'pumila' normally bloom?