Fertilising guide
How to fertilise Moore's Macrozamia (Macrozamia moorei)— schedule & NPK
Also called Moore's Macrozamia, Moore's Cycad, Byfield Cycad.
More about moore's macrozamia
About Moore's Macrozamia
Macrozamia moorei · also called Moore's Macrozamia, Moore's Cycad · tropical
Moore's Macrozamia is one of Australia's largest cycads, native to Queensland's central ranges. Its dramatic arching fronds can reach over 2 m on a stout trunk, making it a bold specimen for large tropical gardens or conservatories. Extremely slow-growing and very long-lived. All parts are severely toxic to pets, livestock, and humans.
Growth habit: Large tree-like cycad with a stout columnar trunk that develops over decades; produces a terminal crown of long arching pinnate fronds.
Watch for — Manganese deficiency (frizzle top): Emerging leaflets appear stunted, necrotic at tips, or twisted — the classic 'frizzle top' of palms and cycads. Apply a chelated manganese sulfate drench to the root zone; correct soil pH if above 7.5, as alkalinity locks out manganese.
What fertiliser moore's macrozamia actually wants — and why
Moore's Macrozamia 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 moore's macrozamia: 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 moore's macrozamia, 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 moore's macrozamia:
Apply a slow-release palm or cycad fertiliser (low nitrogen, higher potassium) once in spring. Avoid over-fertilising — excess nitrogen produces lush but vulnerable growth. A magnesium-containing micronutrient supplement in summer helps maintain deep green fronds. 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 moore's macrozamia 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 moore's macrozamia
Half strength is the safe default for moore's macrozamia — 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 moore's macrozamia first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the moore's macrozamia watering schedule.
Signs you are over-feeding moore's macrozamia
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for moore's macrozamia:
- 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 moore's macrozamia
- 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 moore's macrozamia care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of moore's macrozamia 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 moore's macrozamia
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 moore's macrozamia — frequently asked questions
What fertiliser does moore's macrozamia 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. Moore's Macrozamia 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 moore's macrozamia?
Apply a slow-release palm or cycad fertiliser (low nitrogen, higher potassium) once in spring. Avoid over-fertilising — excess nitrogen produces lush but vulnerable growth. A magnesium-containing micronutrient supplement in summer helps maintain deep green fronds. Apply a slow-release palm or cycad fertiliser (low nitrogen, higher potassium) once in spring. Avoid over-fertilising — excess nitrogen produces lush but vulnerable growth. A magnesium-containing micronutrient supplement in summer helps maintain deep green fronds. 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 moore's macrozamia?
Half strength is the safe default for moore's macrozamia — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding moore's macrozamia 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 moore's macrozamia 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 moore's macrozamia?
Flush the pot of moore's macrozamia 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
- Moore's Macrozamia care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water moore's macrozamia — 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 laelia purpurata
- How to fertilise laelia gouldiana
- How to fertilise laelia rubescens
- All 6887 fertilising guides in the Growli library