Fertilising guide
How to fertilise Coast Redwood Bonsai (Sequoia sempervirens)— schedule & NPK
Also called Coast Redwood Bonsai, California Redwood.
More about coast redwood bonsai
About Coast Redwood Bonsai
Sequoia sempervirens · also called Coast Redwood Bonsai, California Redwood · flowering
Coast Redwood, the world's tallest tree, makes a striking evergreen bonsai with flat, feathery needles and fibrous reddish bark. An outdoor conifer from the foggy California coast, it craves consistent moisture, high humidity, and bright light with shelter from harsh frost. It readily sprouts from the base, making it forgiving for development and group plantings.
Growth habit: Evergreen conifer with a strongly upright, columnar habit and soft, flat sprays of needle foliage; produces fibrous reddish-brown bark and freely sprouts new shoots from the base and trunk (basal burls), aiding recovery and group styling.
What fertiliser coast redwood bonsai actually wants — and why
Coast Redwood Bonsai 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 coast redwood bonsai: 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 coast redwood bonsai, 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 coast redwood bonsai:
Feed with a balanced bonsai fertiliser from spring through autumn; organic slow-release feed plus dilute liquid feed every 2-3 weeks supports its steady evergreen growth. A mildly acidic feed helps maintain rich green colour. Treat that as every 2-3 weeks 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 coast redwood bonsai 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 coast redwood bonsai
Half strength is the safe default for coast redwood bonsai — 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 coast redwood bonsai first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the coast redwood bonsai watering schedule.
Signs you are over-feeding coast redwood bonsai
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for coast redwood bonsai:
- 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 coast redwood bonsai
- 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 coast redwood bonsai care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of coast redwood bonsai 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 coast redwood bonsai
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 coast redwood bonsai — frequently asked questions
What fertiliser does coast redwood bonsai 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. Coast Redwood Bonsai 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 coast redwood bonsai?
Feed with a balanced bonsai fertiliser from spring through autumn; organic slow-release feed plus dilute liquid feed every 2-3 weeks supports its steady evergreen growth. A mildly acidic feed helps maintain rich green colour. Feed with a balanced bonsai fertiliser from spring through autumn; organic slow-release feed plus dilute liquid feed every 2-3 weeks supports its steady evergreen growth. A mildly acidic feed helps maintain rich green colour. Treat that as every 2-3 weeks 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 coast redwood bonsai?
Half strength is the safe default for coast redwood bonsai — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding coast redwood bonsai 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 coast redwood bonsai 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 coast redwood bonsai?
Flush the pot of coast redwood bonsai 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
- Coast Redwood Bonsai care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water coast redwood bonsai — 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 peace lily
- How to fertilise bird of paradise
- How to fertilise hoya
- All 5561 fertilising guides in the Growli library