Fertilising guide
How to fertilise Strict Hygrophila (Hygrophila stricta)— schedule & NPK
Also called Temple Plant, Indian Waterweed, Stricta.
More about strict hygrophila
About Strict Hygrophila
Hygrophila stricta · also called Temple Plant, Indian Waterweed · tropical
Strict Hygrophila is a fast-growing aquatic stem plant native to Southeast Asia, popular in freshwater aquariums for its lance-shaped bright-green leaves. It thrives in moderate to high light and nutrient-rich water, growing rapidly toward the surface. Not individually listed by the ASPCA; generally considered non-toxic to pets.
Growth habit: Fast-growing aquatic stem plant
Watch for — Yellowing leaves: Usually indicates iron or micronutrient deficiency; dose an iron-rich liquid fertiliser and check substrate nutrition.
What fertiliser strict hygrophila actually wants — and why
Strict Hygrophila 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 strict hygrophila: 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 strict hygrophila, 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 strict hygrophila:
Dose a balanced liquid aquarium fertiliser (e.g., Seachem Flourish) weekly following label rates. Iron-rich supplements promote deep-green colouration; avoid excess phosphate which encourages algae competition. Treat that as weekly 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 strict hygrophila 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 strict hygrophila
Half strength is the safe default for strict hygrophila — 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 strict hygrophila first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the strict hygrophila watering schedule.
Signs you are over-feeding strict hygrophila
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for strict hygrophila:
- 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 strict hygrophila
- 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 strict hygrophila care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of strict hygrophila 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 strict hygrophila
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 strict hygrophila — frequently asked questions
What fertiliser does strict hygrophila 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. Strict Hygrophila 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 strict hygrophila?
Dose a balanced liquid aquarium fertiliser (e.g., Seachem Flourish) weekly following label rates. Iron-rich supplements promote deep-green colouration; avoid excess phosphate which encourages algae competition. Dose a balanced liquid aquarium fertiliser (e.g., Seachem Flourish) weekly following label rates. Iron-rich supplements promote deep-green colouration; avoid excess phosphate which encourages algae competition. Treat that as weekly 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 strict hygrophila?
Half strength is the safe default for strict hygrophila — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding strict hygrophila 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 strict hygrophila 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 strict hygrophila?
Flush the pot of strict hygrophila 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
- Strict Hygrophila care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water strict hygrophila — 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 hemisphere torch ginger
- How to fertilise maingay torch ginger
- How to fertilise pink torch ginger
- All 11687 fertilising guides in the Growli library