Grow Sow Greener
Organic White Mustard Microgreen and Sprouting Seeds
Organic White Mustard Microgreen and Sprouting Seeds
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Organic White Mustard Microgreen & Sprouting Seeds
Our untreated, GMO-free organic white mustard seeds are bold, fast-growing, and full of spicy character. With their clean, peppery heat and tender leaves, white mustard microgreens and sprouts are a flavourful addition to salads, sandwiches, egg dishes, and more.
White mustard is known for its bright green leaves and zesty bite—similar to horseradish or wasabi when harvested young. It’s one of the fastest sprouting seeds available, making it perfect for quick kitchen growing, beginners, and those wanting a regular supply of spicy microgreens.
These seeds are certified organic, pathogen-tested, and come packaged in 100% compostable, resealable, and plastic-free pouches—perfect for eco-conscious home growers and micro farms.
Key Benefits
Strong, peppery flavour with a sharp kick
Fast germination—sprouts and microgreens ready in just days
Excellent in savoury dishes, sandwiches, and salads
Rich in antioxidants, vitamins A, C, and K
Our Seeds
Certified Organic and Non-GMO
Untreated and pathogen-tested in a laboratory
Packed in compostable, resealable, plastic-free pouches
Suitable for sprouting and microgreen growing
Growing Information
For Sprouting (in a jar or sprouter):
Soaking time: 2–4 hours
Dark period: 1–2 days
Rinse & drain: Twice daily
Sprouting time: 2–3 days
Time to harvest: 3–5 days, when shoots are green and aromatic
Tip: Mustard seeds are mucilaginous—use a tray or cloth if needed to avoid clumping
For Microgreens (in soil, coir, or on a grow mat):
Soaking time: Not necessary
Sow density: Spread evenly and press gently into moist growing medium
Blackout time: 1–2 days
Time to germination: 2–3 days
Light: Move to indirect light or grow lights after blackout
Watering: Mist daily or water from below to avoid rot
Time to harvest: 5–8 days, depending on your preferred size and spiciness
Best grown in shallow trays with good airflow and moisture control
Sustainability Commitment
All seeds are packaged in eco-friendly, compostable, plastic-free, resealable pouches—supporting low-impact, regenerative growing practices at home or commercially.
- Latin name: Sinapis Alba
- Certified organic: Yes
- Treated seeds: No
- Preferred growing medium: Grow mats, coir or compost
- Pre soak: No
- Time to germination: 3-4 days
- Blackout time: 3 days
- Time to harvest: 7-11 days
- Colour: Green
- Flavour: Delicate peppery flavour
- Nutrients: Extremely high levels of antioxidants amongst other goodies.
- Health: Reported to reduce inflammation and support the respiratory, circulatory, nervous and cardiovascular systems
- Pathogen/microbial lab test: Yes
Learn how to grow White Mustard Microgreens with our Microgreen Growing Guide.
Shipping
Shipping
Delivery Costs
Our shipping is broken down into two categories and are dispatched the same or next day as standard.
1. Unlimited "Small" (Garden) Seed Packets:
- Including wooden plant markers and sprouting bags.
- £1.99 - Standard Delivery 2 - 4 business days.
- £4.90 Express Delivery 1 - 3 business days
2. Everything Else - Sprouting and Microgreen Seeds, Growing Equipment, Gifts and Grow Kits:
UK Mainland.
- £3.85 - Standard Delivery (2 - 4 business days) on orders between 0 and 2kg.
- £6.50 - Next Day Courier Service on orders 0 - 4.5kg.
- £8.95 - Next Day Courier Service on orders over 4.5kg.
- Contact us for a quote on orders over 26kgs.
Ireland, Northern Ireland, Isle of Man, Guernsey and Jersey.
- £9.45 - Standard Delivery (2 - 4 business days) on orders between 0 and 2kg.
- £23.50 - Standard Delivery on orders 2kg - 26kg.
- Contact us for a quote on orders over 26kg.
The EU, Switzerland and Rest of World.
Get in touch for equipment sales to the EU and the rest of the world for a competitive shipping quote. Unfortunately we cannot yet post seeds outside the UK.
Delivery and Packaging
All products are packaged plastic free as standard. Your garden seeds are sealed for freshness inside white glassine envelopes which are a water/vapour resistant compostable paper product whilst your Microgreen and Sprouting Seeds arrive in resealable zip lock pouches made from GMO free vegetable starch which are further heat sealed to ensure these great products reach you safely!
Returns Policy
Returns Policy
We hope you are loving your purchase however we understand that sometimes things don't go as planned and returns and refunds are necessary. Please refer to the following return and refund policies at growsowgreener.co.uk.
My product is damaged defective or you shipped me the wrong product.
We're sorry about that and understand your frustration! We would love to offer you a refund or a replacement. Please contact us at hi@growsowgreener.co.uk within 30 days of purchase for a full refund or replacement.
I ordered the wrong product or simply changed my mind.
No worries, we will refund you the full amount (minus the shipping charges) provided the items are returned in new condition and in original packaging. Once received we will issue your refund however you will be responsible for return shipping costs for non defective products.
Please post to:
Grow Sow Greener
RETURNS (order number)
5 Longfields
West Alvington
Devon TQ73QG
UK
Guaranteed to grow promise.
Should you have absolutely any problems issues or difficulties getting your seeds to germinate or problems/queries regarding our grow kits or equipment, please get in touch at hi@growsowgreener.co.uk and we will strive to help you out via email, call or video call.
All our seeds and products have been tested here by us however if we still cant help you get growing we will offer a free replacement.
Unfortunately, we cannot accept returns on gift cards.
