Getting it to bloom

Why won't my Ranunculus aquatilis bloom? (and how to make it flower)

Also called White Water Crowfoot, Water Buttercup (Ranunculus aquatilis).

More about ranunculus aquatilis

About Ranunculus aquatilis

Ranunculus aquatilis · also called White Water Crowfoot, Water Buttercup · flowering

White water crowfoot is an aquatic buttercup with two leaf forms: thread-like submerged leaves and lobed floating ones, topped in spring and summer by small white five-petalled flowers held above the water. It oxygenates and shelters pond life in clear, cool, flowing or still water, and provides early colour. Note that, like all buttercups, it is toxic to pets.

Plant type: flowering

Watch for — Murky-water decline: It needs clear water for its submerged leaves to photosynthesise; algae blooms or silt-laden water cause it to thin out and fail.

The reasons ranunculus aquatilis isn't blooming

Almost every non-blooming ranunculus aquatilis 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 ranunculus aquatilis 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 ranunculus aquatilis to flower

Maximise sun. Give ranunculus aquatilis 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 ranunculus aquatilis and get the feeding right with the ranunculus aquatilis 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

Ranunculus aquatilis 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 ranunculus aquatilis care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Ranunculus aquatilis blooming — frequently asked questions

Why won't my ranunculus aquatilis flower?

Ranunculus aquatilis 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 ranunculus aquatilis bloom?

Give ranunculus aquatilis 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 ranunculus aquatilis normally bloom?