Fertilising guide

How to fertilise Tulbaghia (Tulbaghia violacea)— schedule & NPK

Also called society garlic, pink agapanthus, wild garlic.

More about tulbaghia

About Tulbaghia

Tulbaghia violacea · also called society garlic, pink agapanthus · herb

Society garlic is a clump-forming South African perennial with grassy, garlic-scented foliage and long-stemmed umbels of fragrant lilac-pink flowers through summer into autumn. Tough, drought-tolerant and long-flowering, it suits sunny borders, gravel gardens and containers. The leaves are edible with a mild garlic flavour, but the plant contains organosulphur compounds that make it risky for pets.

Growth habit: Evergreen to semi-evergreen clump-forming perennial spreading slowly by fleshy rhizomes, with grassy foliage and tall, bare flower stems held above the leaves.

What fertiliser tulbaghia actually wants — and why

Tulbaghia is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.

A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed.

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 tulbaghia: 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 tulbaghia, 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 tulbaghia:

Feed container plants with a balanced liquid fertiliser monthly through the growing season. Border plants need only an annual spring mulch; excess nitrogen favours leaves over flowers. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.

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

Half strength is a sensible default for tulbaghia — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.

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

Signs you are over-feeding tulbaghia

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

Fast, soft, pale growth with diluted, less aromatic flavour.
Early bolting (running to flower) and a bitter edge.
Salt crust and scorched tips on container plants.

Signs you are under-feeding tulbaghia

Pale, slow regrowth after cutting and small leaves.
A tired, stalled plant that cannot keep up with harvesting.
Yellowing older leaves in a long-spent pot.

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

Flushing and leaching the salts

Pot-grown tulbaghia builds up feed salts quickly — water until it drains each time and flush the pot with plain water every few weeks, especially on a sunny windowsill.

Organic vs synthetic feeds for tulbaghia

Organic options

A diluted seaweed feed or worm-casting tea keeps soft growth coming without overdoing it. UK: dilute seaweed or Westland; US: Espoma Garden-tone or Neptune's Harvest. Gentle, hard to overdo, flavour-friendly.

Synthetic / liquid feeds

A balanced liquid feed at half strength through harvesting — UK: Phostrogen, Baby Bio or Westland; US: Miracle-Gro all-purpose at half strength. Fast regrowth; just do not overdo the nitrogen.

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 tulbaghia — frequently asked questions

What fertiliser does tulbaghia need?

A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed. Tulbaghia is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.

How often should I feed tulbaghia?

Feed container plants with a balanced liquid fertiliser monthly through the growing season. Border plants need only an annual spring mulch; excess nitrogen favours leaves over flowers. Feed container plants with a balanced liquid fertiliser monthly through the growing season. Border plants need only an annual spring mulch; excess nitrogen favours leaves over flowers. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.

What strength of feed for tulbaghia?