Fertilising guide
How to fertilise Silver Crown Cotyledon (Cotyledon orbiculata var. oblonga)— schedule & NPK
Also called Silver Crown Cotyledon, Pig's Ear, Round-leafed Navel-wort.
More about silver crown cotyledon
About Silver Crown Cotyledon
Cotyledon orbiculata var. oblonga · also called Silver Crown Cotyledon, Pig's Ear · houseplant
A striking South African succulent with upright stems bearing thick, oval, silvery-grey leaves edged in red and coated in white farina. Produces pendant, orange-red, bell-shaped flowers in summer. Easy to grow in bright conditions with infrequent watering. Excellent as a bold statement plant in a sunny indoor spot or frost-free garden.
Growth habit: Upright, branching sub-shrub
What fertiliser silver crown cotyledon actually wants — and why
Silver Crown Cotyledon 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 silver crown cotyledon: 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 silver crown cotyledon, 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 silver crown cotyledon:
Feed monthly during spring and summer with a half-strength, low-nitrogen succulent fertiliser. Do not feed from autumn through winter. Treat that as monthly 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 silver crown cotyledon 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 silver crown cotyledon
Half strength is the safe default for silver crown cotyledon — 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 silver crown cotyledon first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the silver crown cotyledon watering schedule.
Signs you are over-feeding silver crown cotyledon
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for silver crown cotyledon:
- 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 silver crown cotyledon
- 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 silver crown cotyledon care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of silver crown cotyledon 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 silver crown cotyledon
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 silver crown cotyledon — frequently asked questions
What fertiliser does silver crown cotyledon 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. Silver Crown Cotyledon 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 silver crown cotyledon?
Feed monthly during spring and summer with a half-strength, low-nitrogen succulent fertiliser. Do not feed from autumn through winter. Feed monthly during spring and summer with a half-strength, low-nitrogen succulent fertiliser. Do not feed from autumn through winter. Treat that as monthly 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 silver crown cotyledon?
Half strength is the safe default for silver crown cotyledon — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding silver crown cotyledon 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 silver crown cotyledon 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 silver crown cotyledon?
Flush the pot of silver crown cotyledon 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
- Silver Crown Cotyledon care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water silver crown cotyledon — 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 hoya pubescens
- How to fertilise hoya rigida
- How to fertilise hoya rosarioae
- All 6887 fertilising guides in the Growli library