Basil Thai Siam Queen
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Description
Thai Basil 'Siam Queen' Seeds
If you love Thai Green Curry or spicy stir-fries, standard Italian basil won't cut it. You need 'Siam Queen'. This award-winning variety offers an intense, spicy flavour profile with distinct notes of aniseed, liquorice, and clove.
But it isn't just about flavour. 'Siam Queen' is an architectural beauty. It grows into a sturdy, bushy mound with dark purple stems and, late in the season, produces huge, dense heads of deep violet flowers. It looks spectacular in a pot, smells incredible, and provides the essential finishing touch to your Southeast Asian dishes.
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🌿 Understanding the Plant
Thai Basil is a Tender Annual.
It loves heat even more than sweet basil. It thrives in the hottest part of summer. Unlike other basils where you pinch off flowers to keep the leaves tasting good, 'Siam Queen' leaves retain their flavour even when the plant is blooming, allowing you to enjoy the display and the harvest.
The "Horapha": This is the variety known as *Horapha* in Thailand, used for cooking (as opposed to Holy Basil/Tulsi which is often used for tea/medicinal purposes).
🌱 Growing Guide: How to Sow and Grow
This basil hates the cold. Do not rush it outside!
Germination:
Sow indoors from March to May. Scatter seeds on the surface of moist compost and cover very lightly with vermiculite (they need light to germinate). Keep warm (20°C+). Germination takes 7-14 days.
Where to Sow:
Plant out only when nights are warm (June). It needs a hot, sunny spot sheltered from wind. It grows brilliantly in pots on a sunny patio or greenhouse.
Care While Growing:
Pinch: When the seedling is 15cm tall, pinch out the top set of leaves. This forces it to bush out and creates a sturdier plant that won't flop over.
📋 Plant Specifications
| Latin Name | Ocimum basilicum var. thyrsiflora |
| Common Name | Thai Basil 'Siam Queen' |
| Hardiness | H1c (Tender - needs heat) |
| Light Required | Full Sun ☀️ |
| Height | ↕️ 30cm - 40cm (Bushy) |
| Spread | ↔️ 30cm |
| Spacing | 🌱 25cm apart |
| Great for | 🍛 Thai Curries 🐝 Pollinators 🏺 Containers 💜 Ornamental Foliage |
| Seed Count | Approx. 100 seeds per packet |
🤝 Perfect Garden Companions
Create a spicy, hot-coloured corner of the garden:
- 🌶️ Chillies (e.g., 'Basket of Fire'): The Curry Bed. Thai Basil and Chillies are the perfect culinary pair. They both love the exact same hot, sunny growing conditions and look great together in pots.
- 🧡 Tagetes 'Burning Embers': The Pest Patrol. The strong scent of Marigolds helps deter pests from your basil, while the burnt orange flowers contrast beautifully with the purple stems of 'Siam Queen'.
📅 Sowing & Harvesting Calendar
Sow indoors Spring. Harvest Summer to Autumn.
| Month | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sow Indoors | 🟢 | 🟢 | 🟢 | |||||||||
| Harvest | ✂️ | ✂️ | ✂️ | ✂️ | ✂️ |
⚠️ Edible Flowers
The purple flowers are 100% edible and have a sweet, spicy flavour. Use them to garnish curries, salads, or cocktails for a burst of authentic Thai flavour and colour.
🏆 Officially Recognised Excellence
This variety is an All-America Selections (AAS) Winner, recognized for its superior flavour, disease resistance, and extended flowering period compared to standard Thai basil.
Delivery & Returns
Delivery:
Delivery to mainland UK is calculated at checkout. For all other areas and large orders please ask for a quote. Orders will be sent by express next day delivery (DPD). They will be dispatched on a next working day service, with the exception of Ireland where it may take two days. Please allow up to 48 hours for delivery in the UK as the couriers may have already been and collected on the day you send your order in. Smaller orders for pouches, pockets, bags and pots may be sent via Royal Mail delivery. Please ensure you supply an email address and a mobile so you can be updated about your delivery. Should you have any problems with your delivery, please contact us at sales@naturalgrower.co.uk.Special Deliveries
Saturday or weekday morning deliveries can be arranged, but there will be a surcharge. Please contact us to request a price for either of these delivery services. If you need a parcel sending outside of the UK, please contact us for a quote.Returns:
If you are not completely happy with any product that you have ordered from us, you may return it to us in its original condition any time within 14 calendar days from the date of dispatch. Products must be returned in their original condition. Please contact us at sales@naturalgrower.co.uk to arrange a return. If you return a product by post, you will need to pay the costs of returning the product to us and obtain proof of posting.Be a smarter gardener
Gardening organically is a more affordable and long term alternative to using chemical fertilisers. Natural Grower products eliminate waste because the nutrients are slowly released to the plants as they need them. Over the long-term you save money because your soil health naturally improves, which in turn produces healthier, stronger, disease resistant plants. Chemical products may cost less financially in the short term, but they don’t provide any long-term benefits and the damage they do to the natural eco-system in the soil is costly.
Slow release for sustained growth
Organic fertilisers are broken down slowly by organisms in the soil to produce a more measured, consistent, natural release of nutrients. This results in uniform growth with strong stems and leaves, unlike chemical fertilisers which provide a sudden boost resulting in tall lanky plants. Stronger plants are more resistant to disease, and with the presence of mycorrizhal fungi to strengthen the roots, the plants, soil and fungi all work together long-term to create the perfect natural eco-system.
Love your land
The organic matter in Natural Grower will help keep your soil or compost in optimum condition, retain moisture over the dry summer months and improve the health and structure of your soil. The presence of natural Mycorrhizal fungi in our products enhances root growth, enabling plants to extract nutrients and absorb water more efficiently from the soil or compost. By using our products you will be supporting and enhancing the natural eco-system in the soil.
Embrace sustainability
Natural Grower’s chemical free fertiliser products are approved organic, biodynamic and vegan. Plant-based and free from chemicals they are safe to use around wildlife, pets and children. Eco-friendly and sustainably produced in the UK. Our packaging is made from recycled plastic where possible and is all 100% recyclable. We are always happy to refill used containers, and often sell our products in reused containers or slightly damaged packaging at a reduced price. Reduce, reuse, recycle.

