Fertilising guide
How to fertilise Brazilian Micro Sword (Lilaeopsis brasiliensis)— schedule & NPK
Also called Micro Sword, Carpet Grass, Brazilian Micro Sword Plant.
More about brazilian micro sword
About Brazilian Micro Sword
Lilaeopsis brasiliensis · also called Micro Sword, Carpet Grass · tropical
Lilaeopsis brasiliensis is a small, grass-like aquatic plant that forms a vivid-green lawn carpet in aquarium foregrounds. Native to South America, it grows via creeping runners and is a popular, moderately demanding carpet plant. Not listed as toxic by the ASPCA; considered pet-safe for cats, dogs, and aquarium inhabitants.
Growth habit: Creeping, runner-forming aquatic herb forming a low grass-like carpet
Watch for — Slow runner spread: Without CO2 injection and adequate light, runner spread is very slow. Address these two factors first before assuming substrate or fertiliser issues.
What fertiliser brazilian micro sword actually wants — and why
Brazilian Micro Sword 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 brazilian micro sword: 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 brazilian micro sword, 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 brazilian micro sword:
Apply a balanced liquid fertiliser weekly. Root tabs placed at regular intervals in the substrate are particularly beneficial because the plant feeds heavily from the roots. Potassium and iron help maintain bright green colour. 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 brazilian micro sword 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 brazilian micro sword
Half strength is the safe default for brazilian micro sword — 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 brazilian micro sword first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the brazilian micro sword watering schedule.
Signs you are over-feeding brazilian micro sword
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for brazilian micro sword:
- 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 brazilian micro sword
- 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 brazilian micro sword care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of brazilian micro sword 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 brazilian micro sword
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 brazilian micro sword — frequently asked questions
What fertiliser does brazilian micro sword 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. Brazilian Micro Sword 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 brazilian micro sword?
Apply a balanced liquid fertiliser weekly. Root tabs placed at regular intervals in the substrate are particularly beneficial because the plant feeds heavily from the roots. Potassium and iron help maintain bright green colour. Apply a balanced liquid fertiliser weekly. Root tabs placed at regular intervals in the substrate are particularly beneficial because the plant feeds heavily from the roots. Potassium and iron help maintain bright green colour. 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 brazilian micro sword?
Half strength is the safe default for brazilian micro sword — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding brazilian micro sword 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 brazilian micro sword 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 brazilian micro sword?
Flush the pot of brazilian micro sword 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
- Brazilian Micro Sword care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water brazilian micro sword — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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