Getting it to bloom
Why won't my Hollow-Rooted Fumewort bloom? (and how to make it flower)
Also called Hollow-rooted fumewort, Hollow fumewort, Bird-in-a-bush (Corydalis cava).
More about hollow-rooted fumewort
About Hollow-Rooted Fumewort
Corydalis cava · also called Hollow-rooted fumewort, Hollow fumewort · flowering
Corydalis cava is a spring-ephemeral tuberous perennial native across a broad swathe of central and southern Europe, from the Pyrenees to Ukraine, colonising shaded woodland floors, hedgebanks, and rocky slopes. In late winter and early spring it produces elegant racemes of white, pale lilac, or purple spurred flowers before the divided, glaucous foliage yellows and vanishes by early summer. Its common name refers to the distinctive hollow centre of the mature tuber, in contrast to the solid tuber of C. bulbosa. Plant it under deciduous trees in humus-rich soil and let it self-seed to naturalise. All parts are toxic to cats and dogs.
Plant type: flowering
Watch for — Self-seeding becoming invasive: Under ideal conditions Corydalis cava self-seeds prolifically and can crowd out smaller spring bulbs; deadhead promptly after flowering if controlled naturalising is preferred, or allow to spread freely in wilder garden areas.
The reasons hollow-rooted fumewort isn't blooming
Almost every non-blooming hollow-rooted fumewort 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 hollow-rooted fumewort 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 hollow-rooted fumewort to flower
- Maximise sun. Give hollow-rooted fumewort 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 hollow-rooted fumewort and get the feeding right with the hollow-rooted fumewort 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
Hollow-Rooted Fumewort 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 hollow-rooted fumewort care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.
Hollow-Rooted Fumewort blooming — frequently asked questions
Why won't my hollow-rooted fumewort flower?
Hollow-Rooted Fumewort 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 hollow-rooted fumewort bloom?
Give hollow-rooted fumewort 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 hollow-rooted fumewort normally bloom?
Hollow-Rooted Fumewort flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.
What should I do with hollow-rooted fumewort after it flowers?
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.
What is the single biggest mistake stopping hollow-rooted fumewort flowering?
Feeding hollow-rooted fumewort a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.
Keep reading
- Hollow-Rooted Fumewort care — the full brief (light, water, humidity, problems, pet safety)
- Hollow-Rooted Fumewort light needs — usually the first thing to fix for flowers
- Hollow-Rooted Fumewort fertilising — the right feed for buds, not just leaves
- Should I water my plant? The simple check
- Why is my plant wilting? Wet vs dry
- Underwatered plant — signs and rehydration
- Why won't my peace lily bloom?
- Why won't my jade plant bloom?
- Why won't my tomato bloom?
- All 4114 bloom guides in the Growli library