Getting it to bloom
Why won't my Indian Summer black-eyed Susan bloom? (and how to make it flower)
Also called Indian Summer black-eyed Susan, Indian Summer coneflower, Gloriosa daisy (Rudbeckia hirta 'Indian Summer').
More about indian summer black-eyed susan
About Indian Summer black-eyed Susan
Rudbeckia hirta 'Indian Summer' · also called Indian Summer black-eyed Susan, Indian Summer coneflower · flowering
Rudbeckia hirta 'Indian Summer' is an All-America Selections winner bearing exceptionally large golden-yellow flowers, 15–22 cm (6–9 in) across, from early summer to hard frost. Typically grown as an annual or short-lived perennial, it produces prolific blooms on sturdy stems. Excellent for cutting, containers, and pollinator borders in full sun.
Plant type: flowering
Watch for — Aphids: Clusters of small insects on new stem tips and buds, causing distortion. Blast off with a strong water jet or apply insecticidal soap. Natural predators such as ladybirds usually keep populations in check.
The reasons indian summer black-eyed susan isn't blooming
Almost every non-blooming indian summer black-eyed susan 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 indian summer black-eyed susan 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 indian summer black-eyed susan to flower
- Maximise sun. Give indian summer black-eyed susan 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 indian summer black-eyed susan and get the feeding right with the indian summer black-eyed susan 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
Indian Summer black-eyed Susan 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 indian summer black-eyed susan care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.
Indian Summer black-eyed Susan blooming — frequently asked questions
Why won't my indian summer black-eyed susan flower?
Indian Summer black-eyed Susan 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 indian summer black-eyed susan bloom?
Give indian summer black-eyed susan 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 indian summer black-eyed susan normally bloom?
Indian Summer black-eyed Susan 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 indian summer black-eyed susan 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 indian summer black-eyed susan flowering?
Feeding indian summer black-eyed susan a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.
Keep reading
- Indian Summer black-eyed Susan care — the full brief (light, water, humidity, problems, pet safety)
- Indian Summer black-eyed Susan light needs — usually the first thing to fix for flowers
- Indian Summer black-eyed Susan 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 2566 bloom guides in the Growli library