Fertilising guide
How to fertilise Bove's Jerusalem Sage (Phlomis bovei)— schedule & NPK
Also called Bove's Jerusalem sage, Bove's phlomis, Moroccan phlomis.
More about bove's jerusalem sage
About Bove's Jerusalem Sage
Phlomis bovei · also called Bove's Jerusalem sage, Bove's phlomis · flowering
Phlomis bovei is a tall, robust, woolly-leaved shrub native to the Atlas Mountains and dry hillsides of Morocco and Algeria, where it colonises rocky slopes and scrub at low to moderate altitudes. It produces dense whorls of pink to mauve flowers in early summer on stout, felted stems that can reach considerable height, making it an architectural plant for dry Mediterranean or gravel gardens. Its North African origin means it appreciates warmth and resents prolonged cold or wet winters. Phlomis bovei is not included in the ASPCA database and is classified as mildly-toxic as a precautionary measure.
Growth habit: Tall, erect, multi-stemmed evergreen shrub with robust, densely woolly stems and large greyish leaves.
What fertiliser bove's jerusalem sage actually wants — and why
Bove's Jerusalem Sage is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for bove's jerusalem sage: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed bove's jerusalem sage, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For bove's jerusalem sage:
No regular feeding is needed or beneficial; a very light application of low-nitrogen fertiliser in spring is the maximum advisable in nutrient-poor soils. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when bove's jerusalem sage is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for bove's jerusalem sage
Half strength is the safe default for bove's jerusalem sage — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water bove's jerusalem sage first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the bove's jerusalem sage watering schedule.
Signs you are over-feeding bove's jerusalem sage
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for bove's jerusalem sage:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding bove's jerusalem sage
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full bove's jerusalem sage care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of bove's jerusalem sage with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for bove's jerusalem sage
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising bove's jerusalem sage — frequently asked questions
What fertiliser does bove's jerusalem sage need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Bove's Jerusalem Sage is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed bove's jerusalem sage?
No regular feeding is needed or beneficial; a very light application of low-nitrogen fertiliser in spring is the maximum advisable in nutrient-poor soils. No regular feeding is needed or beneficial; a very light application of low-nitrogen fertiliser in spring is the maximum advisable in nutrient-poor soils. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for bove's jerusalem sage?
Half strength is the safe default for bove's jerusalem sage — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding bove's jerusalem sage look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding bove's jerusalem sage year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of bove's jerusalem sage?
Flush the pot of bove's jerusalem sage with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Bove's Jerusalem Sage care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water bove's jerusalem sage — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise common milkweed
- How to fertilise spider milkweed
- How to fertilise green milkweed
- All 10153 fertilising guides in the Growli library