Where to Buy Seeds Online UK: The Best Seed Suppliers Compared

The UK has some of the best seed suppliers in the world, and buying online opens up far more variety than any local garden centre can offer. But with dozens of companies competing for your order, it can be hard to know who to trust and where the best value lies. This guide compares the major UK online seed suppliers so you can make an informed choice.

What to Look for in a UK Seed Supplier

Before comparing suppliers, it's worth knowing what matters: germination rate (how reliably seeds sprout), variety selection (especially UK-specific and heritage varieties), freshness (seeds have a shelf life), delivery reliability, and price per packet. The cheapest seeds aren't always the best value if germination rates are poor.

Thompson & Morgan

Thompson & Morgan is the UK's largest direct-to-consumer seed and plant retailer, with over 6,000 products. Founded in 1855, they have unrivalled breadth of variety and are particularly strong on vegetable seeds, plug plants, and unusual varieties you won't find elsewhere.

Strengths: Enormous selection, regular sales and offers, strong reputation, good catalogue. Weaknesses: Can feel overwhelming for beginners, some varieties are pricier than competitors. Best for: Experienced growers who know what they want and value variety choice above all else.

Suttons Seeds

Suttons Seeds, based in Paignton, Devon, has been supplying British gardeners since 1806. They're known for reliable, well-tested varieties suited to UK growing conditions. Their website is well-organised and easier to navigate than T&M. They also offer a vegetable garden planner tool.

Strengths: Excellent UK-adapted varieties, good germination rates, competitive prices, helpful growing guides. Weaknesses: Slightly smaller range than T&M. Best for: Beginners and those who want reliable, no-fuss varieties.

Sarah Raven

Sarah Raven is a premium supplier focused on beautiful, productive varieties — particularly cutting flowers, unusual vegetables, and heritage seeds. Her catalogue features varieties selected for flavour, colour, and performance rather than yield alone. Prices are higher, but quality and curation are exceptional.

Strengths: Beautifully curated selection, excellent quality, strong on unusual and heritage varieties, inspirational. Weaknesses: Premium pricing, less focus on high-yield staples. Best for: Those who want to grow something more interesting than the standard supermarket varieties.

YouGarden

YouGarden is strong on plug plants and ready-to-grow items alongside seeds. Their prices are competitive and they frequently run multi-buy offers. They're particularly popular for spring plug plant orders when growers want a head start without sowing from seed themselves.

Strengths: Good prices, plug plant selection, regular offers. Weaknesses: Seed range is smaller than T&M or Suttons. Best for: Those who want plug plants alongside seeds and value price.

The Real Seed Catalogue

The Real Seed Catalogue is a small, family-run supplier specialising exclusively in open-pollinated and heritage varieties that you can save seed from year to year. Their range is deliberately limited but every variety is chosen with passion and deep knowledge. All seeds are non-hybrid and non-GMO.

Strengths: Unique varieties, seed-saving focus, ethical ethos, exceptional flavour. Weaknesses: Very small range, sells out quickly. Best for: Experienced growers interested in heritage varieties and seed saving.

Kings Seeds

Kings Seeds from Kelvedon, Essex is a professional-grade supplier used by many market gardeners and smallholders. Their prices are extremely competitive, especially when bought in bulk, and they stock many commercial varieties alongside standard allotment favourites.

Strengths: Excellent value, strong on vegetable seeds, professional reputation, bulk discounts. Weaknesses: Less focus on ornamentals and unusual varieties. Best for: Allotment holders who want reliable, affordable staple varieties.

Our Recommendations by Grower Type

• Best for beginners: Suttons Seeds — reliable varieties, clear growing guidance, easy website

• Best for variety choice: Thompson & Morgan — unrivalled selection

• Best for quality and unusual varieties: Sarah Raven — worth every penny

• Best value: Kings Seeds — particularly for larger orders

• Best for heritage and seed saving: The Real Seed Catalogue — unbeatable for open-pollinated varieties

Tips for Ordering Seeds Online

Order early — the best varieties sell out by January, especially plug plants and popular tomato and chilli varieties. Order more than you think you need: seed packets are cheap and having backup seeds saves a wasted trip when a first sowing fails. Check 'use by' dates and store unused seeds in a cool, dry, dark place — most vegetable seeds remain viable for 2–3 years if stored well.