Basil Thai Siam Queen (Ocimum basilicum) leaves against a maroon and white background

Basil Thai Siam Queen

£1.95
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Basil Thai Siam Queen (Ocimum basilicum) leaves against a maroon and white background

Basil Thai Siam Queen

Ocimum basilicum var. thyrsiflora 'Siam Queen'

A compact, deeply aromatic Thai basil that keeps its flavour even in full flower. The dense violet flower heads make it as pretty as it is useful.

£1.95

Free UK delivery on seed orders over £40

Dispatched from our Norfolk farm — Royal Mail, usually within one working day.

Your growing year

Sow, plant out and harvest months for this variety

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sow
Plant out
Harvest
SowPlant outHarvest

At a glance

Height
30-45cm
Spread
25cm
Spacing
30cm
Position
Full sun, warm and sheltered. Greenhouse, sunny border, conservatory or windowsill. Tender annual.
Seeds per packet
100
Soil
Rich, fertile, moist but well-drained.
Grow guide How to grow Basil Thai Siam Queen Read the full guide →

About this variety

The aristocrat of the Thai basils, and an All-America Selections winner. Siam Queen takes what is good about traditional Thai basil and makes it bigger — leaves close to twice the size of older strains, more vigour, more uniformity, and better resistance to bolting in heat.

The flavour is correspondingly bolder: a powerful sweet-spicy fragrance of anise and clove with a citrus edge, and it holds through cooking rather than fading in the pan.

It is also unusually handsome for a culinary herb. Deep green leaves on purple-flushed stems, topped through late summer with showy spikes of purple-lavender flowers that stand well above the foliage and draw bees and butterflies. Few herbs earn a place on looks alone; this one comes close.

Plant alongside

Chosen by us, not by an algorithm

All-America Selections winner

All-America Selections is an independent, non-profit trialling organisation. Only varieties that outperform the existing standards across trial grounds in North America are given an award, so it is a genuine mark of garden performance rather than a marketing badge.