Fertilising guide
How to fertilise Aeonium Simsii (Aeonium simsii)— schedule & NPK
Also called Sim's aeonium, mat aeonium, flathead aeonium.
More about aeonium simsii
About Aeonium Simsii
Aeonium simsii · also called Sim's aeonium, mat aeonium · houseplant
Aeonium simsii is a compact, low-growing aeonium from the Canary Islands that forms flat, tight rosettes of glossy green leaves fringed with fine white ciliate hairs and faint red lines. Unlike its taller cousins it stays small and clumps into mats. It enjoys bright light, gritty soil and cool, dry winters. Treat as potentially harmful to pets.
Growth habit: Low, mat-forming aeonium that offsets freely into tight clusters of flat rosettes rather than growing tall.
Watch for — Stretching in low light: Loose, pale rosettes with elongated stems indicate too little light; move to a brighter, cooler spot.
What fertiliser aeonium simsii actually wants — and why
Aeonium Simsii is a light-feeding succulent — a gentle, low-nitrogen feed a few times in growth keeps it plump without forcing the weak, stretched growth over-feeding causes.
A cactus and succulent formula or a diluted balanced feed with modest, even numbers. Avoid high-nitrogen plant foods — they make a succulent etiolate and grow soft, fracture-prone tissue.
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 aeonium simsii: 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 aeonium simsii, 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 aeonium simsii:
Feed monthly with a half-strength balanced or low-nitrogen succulent feed during the autumn-to-spring growing season. Do not feed during summer dormancy. Keep that to monthly between spring through early autumn (roughly March to September) and stop entirely once growth slows for winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when aeonium simsii 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 aeonium simsii
Quarter to half strength at most for aeonium simsii. Succulents take up very little, and a strong dose burns the fine roots before the plant can use it.
Feeding always goes onto already-damp soil, never dry roots — water aeonium simsii first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the aeonium simsii watering schedule.
Signs you are over-feeding aeonium simsii
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for aeonium simsii:
- Stretched, leggy, pale growth with widely spaced leaves.
- A white salt crust on the soil or around the pot rim.
- Brown, crisped leaf tips and edges.
- Soft, mushy tissue at the base — over-feeding plus damp soil rots it.
Signs you are under-feeding aeonium simsii
- Uncommon — succulents tolerate lean conditions well.
- Very slow growth and dull, faded colour over a long period.
- Older leaves shed faster than new ones replace them in a tired old mix.
If the symptoms point at watering, light or roots rather than nutrition, the full aeonium simsii care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Feed lightly enough and you rarely need to flush, but once a year run plain water through the pot of aeonium simsii until it drains clear, and refresh the gritty mix every 2-3 years.
Organic vs synthetic feeds for aeonium simsii
Organic options
A heavily diluted seaweed or worm-casting feed once or twice in summer. UK: a drop of Westland seaweed feed; US: quarter-strength Espoma Cactus! or Dr. Earth liquid. Fresh free-draining mix matters more than any feed.
Synthetic / liquid feeds
A dedicated cactus/succulent liquid at quarter to half strength — UK: Baby Bio Cacti & Succulent Drip Feeders or Westland; US: Miracle-Gro Succulent Plant Food or Schultz Cactus Plus.
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 aeonium simsii — frequently asked questions
What fertiliser does aeonium simsii need?
A cactus and succulent formula or a diluted balanced feed with modest, even numbers. Avoid high-nitrogen plant foods — they make a succulent etiolate and grow soft, fracture-prone tissue. Aeonium Simsii is a light-feeding succulent — a gentle, low-nitrogen feed a few times in growth keeps it plump without forcing the weak, stretched growth over-feeding causes.
How often should I feed aeonium simsii?
Feed monthly with a half-strength balanced or low-nitrogen succulent feed during the autumn-to-spring growing season. Do not feed during summer dormancy. Feed monthly with a half-strength balanced or low-nitrogen succulent feed during the autumn-to-spring growing season. Do not feed during summer dormancy. Keep that to monthly between spring through early autumn (roughly March to September) and stop entirely once growth slows for winter.
What strength of feed for aeonium simsii?
Quarter to half strength at most for aeonium simsii. Succulents take up very little, and a strong dose burns the fine roots before the plant can use it.
What does over-feeding aeonium simsii look like?
Stretched, leggy, pale growth with widely spaced leaves. A white salt crust on the soil or around the pot rim. Brown, crisped leaf tips and edges. Soft, mushy tissue at the base — over-feeding plus damp soil rots it. Feeding aeonium simsii like a leafy houseplant is the classic error — it produces a flush of pale, stretched, floppy growth that never firms up and is prone to rot at the base.
Should I flush the soil of aeonium simsii?
Feed lightly enough and you rarely need to flush, but once a year run plain water through the pot of aeonium simsii until it drains clear, and refresh the gritty mix every 2-3 years.
Keep reading
- Aeonium Simsii care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water aeonium simsii — 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 snake plant
- How to fertilise dracaena
- How to fertilise peperomia
- All 3899 fertilising guides in the Growli library