Fertilising guide

How to fertilise Genovese Basil (Ocimum basilicum 'Genovese')— schedule & NPK

Also called Sweet Basil, Italian Basil.

More about genovese basil

About Genovese Basil

Ocimum basilicum 'Genovese' · also called Sweet Basil, Italian Basil · herb

'Genovese' is the classic Italian sweet basil, with large, glossy, cupped green leaves and a warm, clove-sweet aroma that defines pesto. A tender annual herb, it craves warmth and full sun and sulks in cold, wet soil. Pinch it regularly to keep it bushy and leafy, and it crops abundantly from late spring through summer indoors or out.

Growth habit: Upright, branching tender annual that bushes out when the growing tips are pinched. Regularly removing flower spikes keeps it producing tender leaves; once it flowers and sets seed, leaf production and flavour decline as the plant ages.

What fertiliser genovese basil actually wants — and why

Genovese Basil 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 genovese basil: 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 genovese basil, 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 genovese basil:

Light-to-moderate feeder. In rich soil little is needed; in pots feed every 2-3 weeks with a balanced liquid fertiliser at half strength. Over-feeding with nitrogen can dilute the essential oils that give the leaves their flavour. 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 genovese basil 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 genovese basil

Half strength is a sensible default for genovese basil — 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 genovese basil first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the genovese basil watering schedule.

Signs you are over-feeding genovese basil

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

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 genovese basil

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 genovese basil care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Pot-grown genovese basil 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 genovese basil

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 genovese basil — frequently asked questions

What fertiliser does genovese basil 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. Genovese Basil 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 genovese basil?

Light-to-moderate feeder. In rich soil little is needed; in pots feed every 2-3 weeks with a balanced liquid fertiliser at half strength. Over-feeding with nitrogen can dilute the essential oils that give the leaves their flavour. Light-to-moderate feeder. In rich soil little is needed; in pots feed every 2-3 weeks with a balanced liquid fertiliser at half strength. Over-feeding with nitrogen can dilute the essential oils that give the leaves their flavour. 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 genovese basil?