
Can't go wrong with Cosmos
Lovely packet of seeds, bought one for me and one as gift :)



Brassica rapa var. perviridis
Komatsuna seeds grow into delicious mustard spinach. Sometimes referred to as Japanese mustard spinach, it is milder than the average mustard leaf, yet this variety with its white stems and thick leaves is filled with goodness and the delicious mustard taste without the spicy reputation.
Approx 300 seeds
Komatsuna seeds produce tender, mild mustard greens ideal for salads and stir-fries. Sow from March to September, either directly outdoors or in pots. These Japanese mustard spinach seeds thrive in cool weather and mature quickly, making them a rewarding choice for gardeners seeking unusual vegetable seeds.
Also known as Japanese mustard spinach, Komatsuna offers a gentle mustard flavour without the usual spiciness. This unusual vegetable variety is easy to grow and perfect for pots or garden beds. Enjoy fresh, nutritious greens straight from your garden.
Delivered within 2–3 working days. On its own, this packet ships letterbox delivery at £2.25. Fits through a standard letterbox, so no one needs to be home.
Delivery is priced on the size of your whole order, so adding more may move it into the next band:
Gifting. We can include a handwritten note — add your message at checkout.
More info in our FAQs, or get in touch if something hasn’t arrived.
Komatsuna seeds can be sown outdoors from January through October, thriving in containers, balconies, or garden beds where the soil is fertile and well-prepared. This mild mustard spinach prefers a pot size of around 50 cm to develop tender, flavorful leaves with minimal effort.
Sow Komatsuna seeds thinly into small holes on firm, fertile soil and cover lightly. Keep the soil consistently moist to encourage reliable germination during the sowing months of January to October.
Once seedlings emerge, thin them to avoid overcrowding, allowing enough space for healthy growth within a 50 cm container or garden bed. This biennial plant benefits from regular spacing to ensure the tender greens develop fully from May through November.
Maintain consistent moisture by watering regularly, especially during warmer months, to keep the soil evenly damp but not waterlogged. Harvest young leaves frequently by cutting back to encourage continuous growth, ensuring a steady supply of mild mustard greens throughout the growing season.

Easy to grow, versatile for salads or cooking, ideal for pots or garden beds, mild mustard flavour, unusual and nutritious vegetable variety.

The name 'Komatsuna' means 'greens of Komatsu' in Japanese, named after Komatsugawa village near Tokyo. It was popularised by Tokugawa Yoshimune, the eighth shogun, who enjoyed it during a visit to the area.
| Other Names | Mustard spinach, Japanese mustard spinach and Tender greens. |
|---|---|
| Pet/Baby Safe | Non-toxic |
A mild mustard spinach, also called Japanese mustard spinach, known for its tender leaves and white stems. Botanically it is Brassica rapa var. perviridis, and it also goes by Mustard spinach, Japanese mustard spinach and Tender greens. It is a biennial: leaf in the first year, flowers in the second.
Sow seeds in fertile soil or pots, keep moist, and harvest young leaves for best flavour. Sow Komatsuna seeds thinly into small holes on firm, fertile soil and cover lightly. Keep the soil consistently moist to encourage reliable germination during the sowing months of January to October.
Seedlings usually appear in 5–10 days. Sow from January to October.
Watering: keep soil consistently moist but not waterlogged.
Yes — this is a straightforward packet to give, and what makes it work as a gift is mostly timing. Sowing runs January to October, so a packet given inside that window can go straight in, and one given outside it keeps perfectly well until the season comes round.
There are approximately 300 seeds in the packet, so there is plenty to share. On effort it looks after itself, which matters if you are giving it to someone new to growing. It suits pots, beds and windowsills, so it works for a small space as well as a garden.
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Lovely packet of seeds, bought one for me and one as gift :)

Bought a couple of these as card gifts for friends and they loved them

Liked how you gave tips on how best to sow. nicely done