Fertilising guide

How to fertilise Navel Orange Washington (Citrus sinensis 'Washington')— schedule & NPK

Also called Washington navel orange, navel orange.

More about navel orange washington

About Navel Orange Washington

Citrus sinensis 'Washington' · also called Washington navel orange, navel orange · edible

The Washington navel is the classic seedless eating orange, recognised by the small secondary 'navel' at its blossom end. Sweet, easy to peel and self-fertile, it crops in winter and stores well on the tree. Frost-tender but forgiving, it makes one of the best citrus for a large patio container moved under cover for winter.

Growth habit: Rounded, moderately vigorous evergreen tree with dense glossy foliage and largely thornless branches; bears self-fertile fruit that holds well on the tree.

Watch for — Fruit drop: A normal 'June drop' thins excess fruit, but heavy drop also follows drought stress, cold draughts or feeding lapses; keep conditions steady.

What fertiliser navel orange washington actually wants — and why

Navel Orange Washington is a hungry evergreen fruiter with specific needs — a dedicated citrus feed, switched between summer and winter formulas, keeps it cropping and green.

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 navel orange washington: 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 navel orange washington, 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 navel orange washington:

The dormant-season rule matters more than the exact interval: skip feeding entirely when navel orange washington 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 navel orange washington

Follow the citrus-feed label rate for navel orange washington and use the correct seasonal formula. The trace-element content matters as much as the NPK — substituting a general feed is the usual cause of yellowing.

Feeding always goes onto already-damp soil, never dry roots — water navel orange washington first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the navel orange washington watering schedule.

Signs you are over-feeding navel orange washington

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for navel orange washington:

Salt crust on the soil and scorched, browning leaf tips.
Excess soft leafy growth with poor fruit set from too much nitrogen.
Leaf drop shortly after an over-strong feed.

Signs you are under-feeding navel orange washington

Yellowing leaves — overall pale, or yellow between green veins (magnesium/iron).
Poor flowering and fruit set, small or dropping fruit.
Weak new growth and a generally tired tree.

If the symptoms point at watering, light or roots rather than nutrition, the full navel orange washington care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Potted navel orange washington accumulates salts and benefits from a thorough plain-water flush every couple of months until it drains freely, plus an annual repot or top-dressing of fresh citrus compost.

Organic vs synthetic feeds for navel orange washington

Organic options

Well-rotted manure or compost mulch plus seaweed and an Epsom-salts (magnesium) drench supports navel orange washington naturally. UK: organic citrus feed or seaweed + Epsom salts; US: Espoma Citrus-tone or Dr. Earth Citrus.

Synthetic / liquid feeds

A proprietary summer and winter citrus feed — UK: Westland or Vitax Citrus (summer/winter); US: Miracle-Gro or Espoma Citrus. Using the right seasonal formula is the key to keeping navel orange washington green and cropping.

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 navel orange washington — frequently asked questions

What fertiliser does navel orange washington need?

A specialist citrus fertiliser, which carries the higher nitrogen plus the magnesium, iron and trace elements citrus need — generic feeds quickly leave it yellow and chlorotic. Many ranges have a summer (higher-N) and a winter (lower-N) formula. Navel Orange Washington is a hungry evergreen fruiter with specific needs — a dedicated citrus feed, switched between summer and winter formulas, keeps it cropping and green.

How often should I feed navel orange washington?

Feed every 2-4 weeks with a high-nitrogen summer citrus fertiliser from spring to late summer, then switch to a winter citrus feed. Supplement magnesium and trace elements to prevent the interveinal yellowing common in potted citrus. Feed every 2-4 weeks with a high-nitrogen summer citrus fertiliser from spring to late summer, then switch to a winter citrus feed. Supplement magnesium and trace elements to prevent the interveinal yellowing common in potted citrus. In practice: a summer citrus feed regularly (often roughly fortnightly) from spring to autumn, switching to a winter citrus feed at a reduced rate over the colder months — citrus feed year-round, unlike most container plants.

What strength of feed for navel orange washington?

What does over-feeding navel orange washington look like?

Salt crust on the soil and scorched, browning leaf tips. Excess soft leafy growth with poor fruit set from too much nitrogen. Leaf drop shortly after an over-strong feed. Feeding navel orange washington an ordinary plant food instead of a citrus-specific one is the defining mistake — it lacks the magnesium and iron citrus demand, and the leaves yellow between the veins no matter how often you feed.

Should I flush the soil of navel orange washington?