Fertilising guide
How to fertilise Drooping Spleenwort (Asplenium flaccidum)— schedule & NPK
Also called Drooping Spleenwort, Weeping Spleenwort.
More about drooping spleenwort
About Drooping Spleenwort
Asplenium flaccidum · also called Drooping Spleenwort, Weeping Spleenwort · houseplant
Asplenium flaccidum is a graceful, pendulous fern native to New Zealand, Australia, and the Pacific, producing soft, drooping pinnate fronds that hang elegantly — ideal for hanging baskets or elevated shelves. As an epiphytic or lithophytic species it is adapted to excellent drainage and good air movement. It suits humid, cool-to-intermediate indoor spaces.
Growth habit: Epiphytic or lithophytic fern with pendulous, arching, pinnate fronds
Watch for — Frond tip burn: Brown, desiccated frond tips result from low humidity, fluoride toxicity in tap water, or fertiliser salt build-up. Switch to filtered or rainwater, flush the pot monthly, and increase humidity. Trim affected tips cleanly with sterile scissors.
What fertiliser drooping spleenwort actually wants — and why
Drooping Spleenwort 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 drooping spleenwort: 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 drooping spleenwort, 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 drooping spleenwort:
Feed monthly during spring and summer with a half-strength balanced liquid fertiliser. As an epiphyte it is accustomed to low nutrient levels — over-feeding causes leaf burn and salt accumulation. No feeding in autumn and 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 drooping spleenwort 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 drooping spleenwort
Half strength is the safe default for drooping spleenwort — 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 drooping spleenwort first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the drooping spleenwort watering schedule.
Signs you are over-feeding drooping spleenwort
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for drooping spleenwort:
- 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 drooping spleenwort
- 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 drooping spleenwort care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of drooping spleenwort 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 drooping spleenwort
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 drooping spleenwort — frequently asked questions
What fertiliser does drooping spleenwort 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. Drooping Spleenwort 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 drooping spleenwort?
Feed monthly during spring and summer with a half-strength balanced liquid fertiliser. As an epiphyte it is accustomed to low nutrient levels — over-feeding causes leaf burn and salt accumulation. No feeding in autumn and winter. Feed monthly during spring and summer with a half-strength balanced liquid fertiliser. As an epiphyte it is accustomed to low nutrient levels — over-feeding causes leaf burn and salt accumulation. No feeding in autumn and 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 drooping spleenwort?
Half strength is the safe default for drooping spleenwort — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding drooping spleenwort 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 drooping spleenwort 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 drooping spleenwort?
Flush the pot of drooping spleenwort 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
- Drooping Spleenwort care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water drooping spleenwort — 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 fairy aprons
- How to fertilise lesser bladderwort
- How to fertilise kidney-leaved bladderwort
- All 6887 fertilising guides in the Growli library