Fertilising guide
How to fertilise String of Pearls (Senecio rowleyanus)— schedule & NPK
Also called String of Pearls, String of Beads, Bead Plant.
More about string of pearls
About String of Pearls
Senecio rowleyanus · also called String of Pearls, String of Beads · houseplant
Senecio rowleyanus is a South African succulent producing long, trailing stems strung with perfect spherical leaves — each 'pearl' is a modified, water-storing leaf with a translucent 'window' that channels light. Stunning in hanging baskets, it needs bright indirect light, very infrequent watering, and sharp drainage. Highly toxic to pets — keep well out of reach of cats and dogs.
Growth habit: Trailing, mat-forming succulent; produces long, cascading stems (30–90 cm) densely set with spherical, pearl-like leaves. Grows quickly in the right conditions.
What fertiliser string of pearls actually wants — and why
String of Pearls 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 string of pearls: 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 string of pearls, 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 string of pearls:
Feed once a month during spring and summer with a half-strength, balanced liquid fertiliser or a cactus-specific feed. Do not fertilise in autumn and winter when growth slows. Treat that as once a month 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 string of pearls 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 string of pearls
Half strength is the safe default for string of pearls — 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 string of pearls first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the string of pearls watering schedule.
Signs you are over-feeding string of pearls
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for string of pearls:
- 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 string of pearls
- 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 string of pearls care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of string of pearls 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 string of pearls
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 string of pearls — frequently asked questions
What fertiliser does string of pearls 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. String of Pearls 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 string of pearls?
Feed once a month during spring and summer with a half-strength, balanced liquid fertiliser or a cactus-specific feed. Do not fertilise in autumn and winter when growth slows. Feed once a month during spring and summer with a half-strength, balanced liquid fertiliser or a cactus-specific feed. Do not fertilise in autumn and winter when growth slows. Treat that as once a month 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 string of pearls?
Half strength is the safe default for string of pearls — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding string of pearls 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 string of pearls 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 string of pearls?
Flush the pot of string of pearls 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
- String of Pearls care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water string of pearls — 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 inch plant
- How to fertilise umbrella tree
- How to fertilise aglaonema 'siam aurora' (red chinese evergreen)
- All 6887 fertilising guides in the Growli library