Fertilising guide
How to fertilise Derby Sundew (Drosera derbyensis)— schedule & NPK
Also called Derby sundew.
More about derby sundew
About Derby Sundew
Drosera derbyensis · also called Derby sundew · tropical
Drosera derbyensis is a petiolaris complex sundew named after Derby in the West Kimberley region of Western Australia, where it inhabits seasonally flooded sandy flats and grasslands subject to the intense monsoon climate. It is closely related to Drosera ordensis and Drosera kenneallyi, sharing their requirement for a pronounced hot wet growing season and a warm, distinctly drier rest period. The most critical care point is that this species must be kept warm throughout the year — minimum 18 °C even in the dry rest — as cold and wet in combination is rapidly lethal to the rhizome. Drosera is not listed as toxic to cats or dogs by the ASPCA and is considered non-toxic to pets.
Growth habit: Deciduous rosette-forming perennial; erect petiolate leaves with glandular, mucilage-bearing laminae; plant retreats to the rhizome during the dry season.
What fertiliser derby sundew actually wants — and why
Derby 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 derby 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 derby 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 derby sundew:
Supply small insects to active leaves 3–5 times per growing season; avoid any soil-applied fertiliser as the nutrient-sensitive roots will be damaged even by dilute feeds. 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 derby 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 derby sundew
Half strength is the safe default for derby 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 derby sundew first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the derby sundew watering schedule.
Signs you are over-feeding derby sundew
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for derby 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 derby 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 derby sundew care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of derby 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 derby 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 derby sundew — frequently asked questions
What fertiliser does derby 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. Derby 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 derby sundew?
Supply small insects to active leaves 3–5 times per growing season; avoid any soil-applied fertiliser as the nutrient-sensitive roots will be damaged even by dilute feeds. Supply small insects to active leaves 3–5 times per growing season; avoid any soil-applied fertiliser as the nutrient-sensitive roots will be damaged even by dilute feeds. 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 derby sundew?
Half strength is the safe default for derby sundew — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding derby 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 derby 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 derby sundew?
Flush the pot of derby 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
- Derby Sundew care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water derby 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 guzmania 'rana'
- How to fertilise guzmania conifera
- How to fertilise aechmea 'blue rain'
- All 10153 fertilising guides in the Growli library