Fertilising guide

How to fertilise Walking Stick Kale (Brassica oleracea var. longata)— schedule & NPK

Also called walking stick kale, Jersey kale, tall tree kale, cow cabbage.

More about walking stick kale

About Walking Stick Kale

Brassica oleracea var. longata · also called walking stick kale, Jersey kale · edible

Walking stick kale, the Jersey cabbage, is a curiosity brassica that grows a tall, woody single stem 1.5-3 m high, traditionally dried and varnished into walking canes. Its young leaves are edible like ordinary kale and were historically used as cattle fodder. A long-season biennial, it needs a full growing year, firm staking and a sheltered, fertile site to reach its towering, top-heavy height.

Growth habit: Tall, single-stemmed biennial brassica that elongates into a woody, palm-like trunk topped by a rosette of leaves; left a second year it flowers and sets seed.

Watch for — Clubroot: Swollen, distorted roots cause stunting and wilting in infected brassica soil. Rotate crops over several years, lime to near-neutral pH, and ensure good drainage.

What fertiliser walking stick kale actually wants — and why

Walking Stick Kale is grown entirely for its leaves, so nitrogen is the priority — steady, nitrogen-leaning feeding keeps it growing fast, tender and unbolted.

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 walking stick kale: 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 walking stick kale, 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 walking stick kale:

A very hungry, long-season plant. Prepare the ground deeply with plenty of compost or aged manure and side-dress with a nitrogen-rich fertiliser through the season to fuel the tall stem and continual leaf production. In practice: a balanced or compost-rich start, then a nitrogen side-dress or liquid feed every 3-4 weeks through the cropping period in the main season (spring through early autumn).

The dormant-season rule matters more than the exact interval: skip feeding entirely when walking stick kale 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 walking stick kale

Use the vegetable-feed label rate for walking stick kale. Steady availability matters more than a strong dose — a check in growth makes leaves tough and can trigger bolting.

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

Signs you are over-feeding walking stick kale

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for walking stick kale:

Very soft, floppy, dark-green growth that attracts aphids.
Excess leafy growth at the expense of hearts/heads in cabbage and the like.
Salt crust and scorched leaf edges in containers; nitrate-heavy leaves.

Signs you are under-feeding walking stick kale

Pale, yellow-green leaves, oldest first, and slow growth.
Small, tough, bitter leaves and premature bolting.
Weak, stunted heads in cabbage, broccoli and cauliflower.

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

Flushing and leaching the salts

For container-grown walking stick kale, water until it drains freely each time and flush pots monthly with plain water to stop nitrogen salts accumulating; in the ground, good compost levels naturally buffer this.

Organic vs synthetic feeds for walking stick kale

Organic options

Well-rotted manure or compost dug in, plus nitrogen-rich liquid feeds like diluted chicken-manure pellets or nettle feed. UK: pelleted chicken manure or Westland; US: Espoma Garden-tone or blood meal. Steady and soil-building.

Synthetic / liquid feeds

A balanced feed at planting then a high-nitrogen liquid or granular side-dress — UK: Growmore then a nitrogen feed or Phostrogen; US: a 10-10-10 then a high-N (e.g. 21-0-0) side-dress or Miracle-Gro.

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 walking stick kale — frequently asked questions

What fertiliser does walking stick kale need?

A nitrogen-leaning feed (higher first number) or compost-rich soil — nitrogen drives the fast, tender leafy growth this crop is grown for. Phosphorus and potassium matter far less here than for fruiting crops. Walking Stick Kale is grown entirely for its leaves, so nitrogen is the priority — steady, nitrogen-leaning feeding keeps it growing fast, tender and unbolted.

How often should I feed walking stick kale?

A very hungry, long-season plant. Prepare the ground deeply with plenty of compost or aged manure and side-dress with a nitrogen-rich fertiliser through the season to fuel the tall stem and continual leaf production. A very hungry, long-season plant. Prepare the ground deeply with plenty of compost or aged manure and side-dress with a nitrogen-rich fertiliser through the season to fuel the tall stem and continual leaf production. In practice: a balanced or compost-rich start, then a nitrogen side-dress or liquid feed every 3-4 weeks through the cropping period in the main season (spring through early autumn).

What strength of feed for walking stick kale?