Fertilising guide
How to fertilise Old Father Live Forever (Pelargonium cotyledonis)— schedule & NPK
Also called Old Father Live Forever, St Helena Geranium.
More about old father live forever
About Old Father Live Forever
Pelargonium cotyledonis · also called Old Father Live Forever, St Helena Geranium · flowering
Pelargonium cotyledonis is a remarkable succulent-stemmed species endemic to the island of St Helena in the South Atlantic, making it one of the few pelargoniums native outside continental Africa. It forms a thick, pale, water-storing stem topped with large, rounded, slightly hairy leaves and produces clusters of small white flowers. Its unique island origin means it tolerates slightly more moisture and cooler summers than Cape species, but still demands excellent drainage and a frost-free minimum. Toxic to cats, dogs, and horses.
Growth habit: Upright, single-stemmed or sparsely branched succulent shrublet with a smooth, swollen, pale green-grey trunk; older plants develop a distinctly bonsai-like appearance.
What fertiliser old father live forever actually wants — and why
Old Father Live Forever 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 old father live forever: 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 old father live forever, 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 old father live forever:
Apply a dilute, half-strength balanced or low-nitrogen fertiliser monthly in spring and summer only; over-feeding produces lush, disease-prone growth at the expense of the plant's compact, succulent character. 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 old father live forever 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 old father live forever
Half strength is the safe default for old father live forever — 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 old father live forever first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the old father live forever watering schedule.
Signs you are over-feeding old father live forever
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for old father live forever:
- 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 old father live forever
- 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 old father live forever care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of old father live forever 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 old father live forever
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 old father live forever — frequently asked questions
What fertiliser does old father live forever 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. Old Father Live Forever 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 old father live forever?
Apply a dilute, half-strength balanced or low-nitrogen fertiliser monthly in spring and summer only; over-feeding produces lush, disease-prone growth at the expense of the plant's compact, succulent character. Apply a dilute, half-strength balanced or low-nitrogen fertiliser monthly in spring and summer only; over-feeding produces lush, disease-prone growth at the expense of the plant's compact, succulent character. 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 old father live forever?
Half strength is the safe default for old father live forever — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding old father live forever 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 old father live forever 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 old father live forever?
Flush the pot of old father live forever 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
- Old Father Live Forever care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water old father live forever — 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 soft-stem bulrush
- How to fertilise lance-leaved water plantain
- How to fertilise common spike-rush
- All 10153 fertilising guides in the Growli library