Holy Basil

Holy Basil (Ocimum tenuiflorum), also known as Tulsi or Rama Tulsi, is an aromatic herb native to tropical and subtropical Asia, revered in Hindu tradition and widely used in herbal medicine. The foliage carries a distinctive spicy, clove-like fragrance and the plant produces slender pale mauve to purple flower spikes that attract bees and beneficial insects. In Nordic conditions it behaves as a warm-season annual and requires a warm, sheltered position or indoor cultivation to thrive. It grows well in containers and prefers rich, well-drained soil with a pH of 5.5–7.

Growing

Start seeds indoors 6 weeks before outdoor soil reaches a stable 15 °C. Sow seeds 0.5 cm deep in trays filled with a well-draining seed-starting mix; germination is best when soil temperature is held between 20–25 °C and typically takes 10–15 days. Keep seedlings under bright light and maintain warmth throughout. Transplant outdoors only once nights consistently stay above 15 °C, spacing plants 30 cm apart in a full-sun position in rich, composted, well-drained soil.

Care

Water consistently but avoid waterlogging; allow the top 2 cm of soil to dry slightly between waterings. Feed every 2–3 weeks with a balanced liquid fertiliser once established. Tip-prune stems regularly to encourage bushy, branching growth and delay flowering. Remove flower buds as they appear to prolong leaf production; once the plant sets seed, leaf quality and quantity decline sharply.

Harvest

Begin harvesting leaves once the plant has reached 20–25 cm in height and has developed several sets of true leaves, which typically occurs around 80 days from transplanting. Pinch or snip stems just above a leaf node, taking no more than one-third of the plant at any one time. Harvest before flower buds fully open for the most aromatic leaves. Continued regular harvesting extends the productive window by 60 days or more.

In the kitchen

Use fresh Holy Basil leaves in herbal teas, stir-fries, soups, and curries — it is a cornerstone ingredient in Thai cuisine, particularly pad krapao. The clove-spiced flavour is more peppery and robust than sweet basil, holding up well to heat. Tear or chop leaves and add them to salads, rice dishes, or noodle bowls. The flowers are also edible and make an attractive, flavourful garnish.

Storing

Store freshly picked stems upright in a glass of water at room temperature, away from direct sunlight, for up to 5 days. For longer storage, dry leaves at low heat (under 40 °C) and keep in an airtight jar away from light for up to 6 months. Leaves can also be frozen whole on a tray and then transferred to a sealed bag; use directly from frozen in cooked dishes.