Getting it to bloom

Why won't my Agapanthus 'Headbourne Hybrids' bloom? (and how to make it flower)

Also called Headbourne Hybrid agapanthus, hardy agapanthus (Agapanthus 'Headbourne Hybrids').

More about agapanthus 'headbourne hybrids'

About Agapanthus 'Headbourne Hybrids'

Agapanthus 'Headbourne Hybrids' · also called Headbourne Hybrid agapanthus, hardy agapanthus · flowering

Agapanthus 'Headbourne Hybrids' is a hardy, deciduous strain bred for British gardens, throwing rounded heads of blue to violet trumpet flowers on tall stems from July to August. Strappy, dying-back foliage lets it survive frost better than evergreen kinds. It thrives in full sun and sharply drained soil, flowering best when the roots are slightly congested.

Plant type: flowering

Watch for — Few or no flowers: Usually too much shade, an over-rich nitrogen feed, or a recently divided clump. Give full sun, switch to high-potash feed, and leave roots slightly congested.

The reasons agapanthus 'headbourne hybrids' isn't blooming

Almost every non-blooming agapanthus 'headbourne hybrids' 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 agapanthus 'headbourne hybrids' 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 agapanthus 'headbourne hybrids' to flower

Maximise sun. Give agapanthus 'headbourne hybrids' 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 agapanthus 'headbourne hybrids' and get the feeding right with the agapanthus 'headbourne hybrids' 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

Agapanthus 'Headbourne Hybrids' 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 agapanthus 'headbourne hybrids' care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Agapanthus 'Headbourne Hybrids' blooming — frequently asked questions

Why won't my agapanthus 'headbourne hybrids' flower?

Agapanthus 'Headbourne Hybrids' 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 agapanthus 'headbourne hybrids' bloom?

Give agapanthus 'headbourne hybrids' 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 agapanthus 'headbourne hybrids' normally bloom?