Getting it to bloom
Why won't my Jerusalem Sage bloom? (and how to make it flower)
Also called Jerusalem sage, Shrubby Jerusalem sage (Phlomis fruticosa).
More about jerusalem sage
About Jerusalem Sage
Phlomis fruticosa · also called Jerusalem sage, Shrubby Jerusalem sage · flowering
Phlomis fruticosa is a bold, drought-resistant evergreen shrub native to the dry hillsides and rocky slopes of the Eastern Mediterranean, from Greece and Turkey to the Middle East, where it thrives in thin, well-drained soils under intense sun. In early summer it produces striking architectural whorls of deep golden-yellow, hooded flowers arranged in tiers along upright stems, and the dried seed heads provide strong winter structure if left in place. Despite superficially resembling sage (Salvia), the foliage is not aromatic; the single most critical care fact is that it requires full sun and very free-draining soil — wet, cold winters cause rotting at the crown. It holds the RHS Award of Garden Merit and is one of the most reliable drought-tolerant shrubs for UK gardens. Phlomis fruticosa is not recorded in the ASPCA toxic plant database; it is classified mildly-toxic as a precaution since it is not formally confirmed as non-toxic.
Plant type: flowering
The reasons jerusalem sage isn't blooming
Almost every non-blooming jerusalem sage 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 jerusalem sage 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 jerusalem sage to flower
- Maximise sun. Give jerusalem sage 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 jerusalem sage and get the feeding right with the jerusalem sage 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
Jerusalem Sage 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 jerusalem sage care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.
Jerusalem Sage blooming — frequently asked questions
Why won't my jerusalem sage flower?
Jerusalem Sage 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 jerusalem sage bloom?
Give jerusalem sage 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 jerusalem sage normally bloom?
Jerusalem Sage 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 jerusalem sage 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 jerusalem sage flowering?
Feeding jerusalem sage a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.
Keep reading
- Jerusalem Sage care — the full brief (light, water, humidity, problems, pet safety)
- Jerusalem Sage light needs — usually the first thing to fix for flowers
- Jerusalem Sage 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