Making the Most of Spring in the Garden

Spring is the season of possibility. After months of cold and dormancy, rising soil temperatures, lengthening days, and increasing light levels signal it's time to get growing. But spring can be deceiving — warm spells can give way to late frosts, and jumping the gun with tender plants can set your garden back weeks. This guide helps you plan strategically, starting at the right time with the right plants.

Note: The timings below are based on a typical temperate climate (similar to the UK and Northern Europe or USDA Zones 6–8). Adjust based on your local last frost date.

Early Spring (Late February – March): Sow Under Cover

Outdoor conditions are still too cold and unpredictable for most planting, but this is a busy time for indoor seed starting. Focus on plants that need a long growing season or benefit from an early start.

What to Sow Indoors / Under Glass:

  • Tomatoes — Start 6–8 weeks before last frost date
  • Peppers and chillies — Slow-growing; start now for a productive season
  • Aubergines (eggplant) — Need long, warm growing season
  • Onions and leeks — Sow in deep trays; prick out when pencil-thin
  • Annual flowers — Antirrhinums, petunias, and lobelia benefit from early starts
  • Hardy perennial herbs — Lavender, rosemary from seed (slow growers)

What to Sow Outdoors (in mild areas or with protection):

  • Broad beans (hardy; can tolerate light frost)
  • Early peas under fleece
  • Spinach and other hardy greens

Mid-Spring (April): A Busy Transition Month

April is often the most hectic month in the garden. Outdoor conditions are improving, but frosts can still occur — especially at night. Use cloches, fleece, and cold frames to extend your options.

Direct Sow Outdoors:

  • Carrots — Sow thinly in drills; don't transplant
  • Beetroot — Direct sow from mid-April
  • Radish — Fast-growing; great for filling gaps
  • Lettuce and salad leaves — Sow in succession every 2–3 weeks for continuous harvest
  • Chard and kale — Hardy and reliable
  • Hardy annual flowers — Cornflowers, calendula, nigella, poppies

Continue Sowing Indoors:

  • Cucumbers, courgettes (zucchini), squash — 3–4 weeks before last frost
  • Basil and tender herbs
  • Half-hardy annuals for summer bedding

Late Spring (May): The Main Planting Season Begins

After your last expected frost date has passed, the garden opens up dramatically. This is the month most gardeners eagerly wait for — when tender plants can finally go outside.

Transplant Outdoors After Frost Risk Has Passed:

  • Tomatoes (harden off for 7–10 days first)
  • Courgettes and squash
  • Cucumbers (warm, sheltered spot)
  • Peppers and aubergines (in the warmest spots or polytunnel)
  • Summer bedding plants and tender annuals

Direct Sow Outdoors in May:

  • French and runner beans
  • Sweetcorn (in blocks for good pollination)
  • Courgettes and squash direct to final position
  • Sunflowers, zinnias, cosmos

Spring Planting Calendar at a Glance

Month Sow Indoors Sow Outdoors Transplant
February–March Tomatoes, peppers, onions, aubergines Broad beans, peas (with protection) —
April Cucumbers, courgettes, basil Carrots, beetroot, salad, chard, hardy annuals Leeks, onion seedlings
May Catch-up sowing Beans, sweetcorn, squash, zinnias Tomatoes, peppers, bedding plants

Essential Spring Soil Preparation Tips

  1. Don't work wet soil — wait until it no longer sticks to your boots
  2. Add compost or well-rotted manure to beds before sowing
  3. Check soil temperature before direct sowing — most vegetables need at least 7°C (45°F)
  4. Remove winter weeds early before they set seed
  5. Harden off seedlings gradually over 7–14 days before transplanting

Spring rewards those who plan ahead. Keep a simple garden journal to track what you sow, when you sow it, and how it performs — over time, you'll develop an intuitive feel for your own garden's microclimate and what works best in your space.