Getting it to bloom

Why won't my Japanese Tree Lilac 'Ivory Silk' bloom? (and how to make it flower)

Also called Japanese Tree Lilac (Syringa reticulata 'Ivory Silk').

More about japanese tree lilac 'ivory silk'

About Japanese Tree Lilac 'Ivory Silk'

Syringa reticulata 'Ivory Silk' · also called Japanese Tree Lilac · flowering

Syringa reticulata 'Ivory Silk' is a small, single-stemmed lilac grown as a tree rather than a shrub. In early summer, after most lilacs finish, it bears huge creamy-white flower clusters above dark green leaves, set off by cherry-like reddish-brown bark. Tough, cold-hardy, and pollution-tolerant, it is a popular compact street and lawn tree.

Plant type: flowering

Watch for — Sparse bloom in shade or after wrong pruning: It flowers on old wood in early summer, so shade and late pruning both cut bloom. Site in full sun and prune only right after flowering.

The reasons japanese tree lilac 'ivory silk' isn't blooming

Almost every non-blooming japanese tree lilac 'ivory silk' 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 japanese tree lilac 'ivory silk' 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 japanese tree lilac 'ivory silk' to flower

Maximise sun. Give japanese tree lilac 'ivory silk' 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 japanese tree lilac 'ivory silk' and get the feeding right with the japanese tree lilac 'ivory silk' 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

Japanese Tree Lilac 'Ivory Silk' 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 japanese tree lilac 'ivory silk' care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Japanese Tree Lilac 'Ivory Silk' blooming — frequently asked questions

Why won't my japanese tree lilac 'ivory silk' flower?

Japanese Tree Lilac 'Ivory Silk' 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 japanese tree lilac 'ivory silk' bloom?

Give japanese tree lilac 'ivory silk' 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 japanese tree lilac 'ivory silk' normally bloom?