Fertilising guide
How to fertilise Oxycardium (Philodendron hederaceum var. oxycardium)— schedule & NPK
Also called Oxycardium, Cordatum.
More about oxycardium
About Oxycardium
Philodendron hederaceum var. oxycardium · also called Oxycardium, Cordatum · houseplant
Oxycardium is the familiar all-green heartleaf philodendron (a variety of Philodendron hederaceum, long sold as P. oxycardium or cordatum). Its glossy, heart-shaped leaves trail gracefully or climb, and it is one of the toughest, most forgiving houseplants, tolerating low light and irregular watering. A reliable first plant that grows fast in indirect light.
Growth habit: Vigorous trailing or climbing vine with aerial roots; cascades from hanging pots or climbs a moss pole, producing heart-shaped leaves quickly along flexible stems.
Watch for — Brown leaf tips: Dry air or fertiliser salt buildup. Raise humidity slightly and flush the soil with plain water periodically.
What fertiliser oxycardium actually wants — and why
Oxycardium 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 oxycardium: 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 oxycardium, 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 oxycardium:
Feed monthly in spring and summer with a balanced liquid houseplant fertiliser at half strength. It is a light feeder that grows well even with minimal feeding. Pause in the cooler months and flush the soil occasionally to clear salts. 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 oxycardium 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 oxycardium
Half strength is the safe default for oxycardium — 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 oxycardium first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the oxycardium watering schedule.
Signs you are over-feeding oxycardium
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for oxycardium:
- 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 oxycardium
- 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 oxycardium care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of oxycardium 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 oxycardium
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 oxycardium — frequently asked questions
What fertiliser does oxycardium 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. Oxycardium 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 oxycardium?
Feed monthly in spring and summer with a balanced liquid houseplant fertiliser at half strength. It is a light feeder that grows well even with minimal feeding. Pause in the cooler months and flush the soil occasionally to clear salts. Feed monthly in spring and summer with a balanced liquid houseplant fertiliser at half strength. It is a light feeder that grows well even with minimal feeding. Pause in the cooler months and flush the soil occasionally to clear salts. 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 oxycardium?
Half strength is the safe default for oxycardium — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding oxycardium 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 oxycardium 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 oxycardium?
Flush the pot of oxycardium 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
- Oxycardium care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water oxycardium — 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 2464 fertilising guides in the Growli library