Fertilising guide
How to fertilise Forked Sundew (Drosera binata)— schedule & NPK
Also called Forked sundew, Fork-leaved sundew, Twin-leaved sundew, Australian sundew.
More about forked sundew
About Forked Sundew
Drosera binata · also called Forked sundew, Fork-leaved sundew · houseplant
Drosera binata is a warm-temperate carnivorous perennial native to Australia and New Zealand, where it grows in sunny, nutrient-poor, seasonally wet bogs and scrub. Its distinctive forked (dichotomous) leaves, covered in red glandular tentacles, branch once, twice, or more times depending on the form — the 'T-form' forks once, while 'multifida' and 'extrema' forms branch repeatedly into dozens of fine arms. It is larger and more robust than most sundews and will catch medium-to-large insects with ease. It goes through a winter dormancy — growth slows or dies back to the roots — that is essential for long-term health. Mildly-toxic by precaution; the genus Drosera is not individually listed by the ASPCA and no significant toxic principles are documented.
Growth habit: Upright, clump-forming herbaceous perennial with tall, forked strap leaves; dies back to the rootstock in winter before re-emerging in spring.
What fertiliser forked sundew actually wants — and why
Forked Sundew 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 forked sundew: 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 forked sundew, 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 forked sundew:
Do not add fertiliser to soil or water; the plant meets all its nutritional needs from captured insects. In insect-poor indoor environments, offer small live or dried insects to active tentacles every 2–3 weeks during the growing season. Treat that as sparingly through the growing season 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 forked sundew 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 forked sundew
Half strength is the safe default for forked sundew — 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 forked sundew first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the forked sundew watering schedule.
Signs you are over-feeding forked sundew
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for forked sundew:
- 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 forked sundew
- 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 forked sundew care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of forked sundew 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 forked sundew
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 forked sundew — frequently asked questions
What fertiliser does forked sundew 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. Forked Sundew 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 forked sundew?
Do not add fertiliser to soil or water; the plant meets all its nutritional needs from captured insects. In insect-poor indoor environments, offer small live or dried insects to active tentacles every 2–3 weeks during the growing season. Do not add fertiliser to soil or water; the plant meets all its nutritional needs from captured insects. In insect-poor indoor environments, offer small live or dried insects to active tentacles every 2–3 weeks during the growing season. Treat that as sparingly through the growing season 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 forked sundew?
Half strength is the safe default for forked sundew — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding forked sundew 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 forked sundew 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 forked sundew?
Flush the pot of forked sundew 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
- Forked Sundew care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water forked sundew — 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 highland pitcher plant
- How to fertilise purple pitcher plant
- How to fertilise cape sundew
- All 10153 fertilising guides in the Growli library