What to Sow and Grow in May

What to Sow and Grow in May

Posted by Alix Francis on 1st May 2018

It’s quite frightening to think that summer is fast approaching. It feels as though we haven’t seen much of spring yet.

Now the weather is, dare I say it becoming more stable, you can start planting and sowing out bedding, of course this all depends on what the weather is like in your region.

Watch out for those late frosts and keep the lawn tidy as the warmer weather creeps up.

Allotment & Vegetable Garden

  • Earth up potatoes once growth has reached around 25cm and continue to grow seed potatoes.
  • Regularly water young plants to keep them growing strongly.
  • Once the frosts have passed, start planting out tender vegetables.
  • Sweetcorn can now be sown out in block rows.
  • Sow root vegetables.
  • Liquid feed and tie in tomatoes.
  • Protect young fruit from rotting by placing straw under strawberries.

Greenhouse & Undercover

  • Once you’re certain the frosts have passed, move your tender plants our of the greenhouse.
  • If it gets warm enough this month, sow melons.
  • Basil can now be sown in pots.
  • Pumpkin, marrow, squash and courgettes can be sown undercover.
  • Grow cucumber and gherkin seeds in individual pots.
  • Lettuce can be sown in module trays for planning out in the garden later.
  • French Beans & Runner Beans can be sown indoors or undercover (depending on weather)

Pests & Diseases

As it gets warmer, pests and disease become more difficult to deal with. It’s advisable to regularly inspect plants and your structures for pests such as red spider mite, whitefly and other pests.

Like with any disease, the earlier you catch it, the more manageable it will be. Keep a close eye on the undersides of leaves to spot infestations.

To reduce the risk of red spider mite, dampen down the floors of your greenhouse on warmer days.

Keep your greenhouse tidy by clearing away debris and compost to reduce the risk of diseases spreading.

List of Veggies to Sow and Grow this month


  • Beetroot
  • Cucumbers
  • French beans
  • Runner beans
  • Sweetcorn


  • Cabbages (summer, autumn, winter, and red)
  • Cauliflower (summer and autumn)
  • Chicory (sugarloaf and radicchio)
  • Chillies and peppers
  • Courgettes and summer squash
  • Endive
  • French beans
  • Kale
  • Marrows
  • Pumpkins and winter squash
  • Runner beans
  • Sprouting broccoli


  • Beetroot
  • Brussels sprouts
  • Cabbages (summer, autumn, winter, and red)
  • Calabrese
  • Carrots
  • Cauliflower
  • Chicory (Belgian)
  • Florence fennel
  • French beans
  • Kale
  • Kohl rabi
  • Lettuce
  • Oriental leaves
  • Peas
  • Radishes
  • Rocket
  • Runner beans
  • Salad leaves
  • Spring onions
  • Sprouting broccoli
  • Swede
  • Swiss chard/ Spinach beet
  • Turnips