Getting it to bloom

Why won't my Siberian Elm Bonsai bloom? (and how to make it flower)

Also called Siberian Elm Bonsai, Dwarf Elm (Ulmus pumila).

More about siberian elm bonsai

About Siberian Elm Bonsai

Ulmus pumila · also called Siberian Elm Bonsai, Dwarf Elm · flowering

Siberian Elm (Ulmus pumila) is an extremely hardy, fast-growing deciduous tree with small leaves and strong backbudding, often sold as 'dwarf elm' bonsai. It tolerates drought, cold, hard pruning and poor soil, making it nearly indestructible for beginners. It ramifies densely and is more resistant to Dutch elm disease than European elms.

Plant type: flowering

The reasons siberian elm bonsai isn't blooming

Almost every non-blooming siberian elm bonsai 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 siberian elm bonsai 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 siberian elm bonsai to flower

Maximise sun. Give siberian elm bonsai 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 siberian elm bonsai and get the feeding right with the siberian elm bonsai 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

Siberian Elm Bonsai 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 siberian elm bonsai care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Siberian Elm Bonsai blooming — frequently asked questions

Why won't my siberian elm bonsai flower?

Siberian Elm Bonsai 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 siberian elm bonsai bloom?

Give siberian elm bonsai 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 siberian elm bonsai normally bloom?