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Seed Spacing & Quantity Calculator (UK)

Plan Your Vegetable Garden Like a Pro

Welcome to Growseed’s free UK seed spacing and quantity calculator – designed for gardeners of all experience levels. Whether you’re sowing a few lettuces in a small raised bed or planning out rows of runner beans on your allotment, this tool helps you:

✓ Calculate how many seeds you’ll need per bed
✓ Set correct row and plant spacing for healthy growth
✓ Get thinning guidance to improve crop success
✓ Quick-link to buy the right seeds from our trusted UK seed collection

Why Seed Spacing Matters

Correct spacing makes all the difference between a thriving harvest and a failed crop. With the right plant distance, you’ll:

  • Reduce overcrowding and lower the risk of disease
  • Improve airflow and light exposure
  • Promote strong root systems and healthy growth
  • Limit competition for moisture and nutrients

Our calculator includes spacing guidelines for 35+ vegetables—from beetroot and broccoli to courgettes and chard. Each crop has different needs, and this tool adjusts automatically based on your chosen variety.

How to Use the Calculator

  • Measure your growing area (in metres)
  • Select your vegetable from the dropdown list
  • Click "Calculate"
  • View your results: total seeds needed, row spacing, thinning advice

You’ll also get a direct link to purchase that seed variety right from our catalogue.

Growseed Growing Tips for UK Gardeners

  • Rotate crops annually to prevent pest build-up and soil depletion
  • Start early with hardy varieties like spinach, spring onions and broad beans
  • Use cloches or fleece to extend your growing season, especially in early spring or autumn
  • Know when to direct sow vs transplant – check your seed packet or visit our Help & Advice section

Why Buy from Growseed?

As a UK-based seed supplier, Growseed is trusted by thousands of growers for:

  • Top-quality, non-GMO seeds suited to the UK climate
  • Affordable prices and fast UK delivery
  • Detailed growing advice backed by real-world experience
  • A focus on sustainability and customer support

Each seed in this calculator links directly to its product page—so you’re always one step away from growing success.

Growseed Sowing Calculator Tool

Use our free calculator below to get estimated harvests, seed spacing, and thinning recommendations tailored to your chosen vegetable.