15 gardening tips for May

Gardening in May: 15 Expert Tips for a Beautiful, Summer-Ready Garden 🌸

May is one of the most rewarding months in the gardening calendar. With warmer temperatures, longer days, and gardens bursting into life, gardening in May is all about planting, nurturing, and preparing for a vibrant summer ahead.

Whether you’re growing your own vegetables, refreshing your borders, or adding colour to containers, these expert gardening tips will help you make the most of your outdoor space this month.

🌼 Add Instant Colour with Summer Bedding

Brighten patios and entrances with summer bedding plants.

Best choices include:

  • Petunias, geraniums, and lobelia for sunny spots
  • Begonias and busy lizzies for shade

👉 Expert Tip: In colder regions, wait until late May to avoid frost damage.

🌷 Care for Spring Bulbs

2. Cut Back & Divide Bulbs

Once foliage has died back:

  • Cut leaves down to ground level
  • Lift and divide overcrowded clumps

This keeps displays healthy and encourages better flowering next year.

🌸 Sow Flowers for Summer Displays

3. Sow Hardy Annuals Outdoors

Direct sow:

  • Sunflowers
  • Poppies
  • Cornflowers

👉 These are easy to grow and provide long-lasting colour.

🥕 Grow Your Own: Kitchen Garden Tasks

4. Start Tender Vegetables Indoors

Sow in pots or trays:

  • Courgettes
  • Runner beans
  • French beans

Keep them warm in a greenhouse or on a sunny windowsill ready for planting out.

  • Earth up stems to protect tubers from sunlight and increase the length of underground stems that will bear potatoes
  • Plant remaining maincrop potatoes

👉 Why it matters: Exposed potatoes turn green and become unsafe to eat.

Move young tomato plants into larger pots to encourage strong root growth.

  • Harden off before planting outdoors
  • Wait until late May when frost risk has passed

7. Sow Herbs for Fresh Flavour

Grow your own herbs easily:

  • Sow basil indoors on a sunny windowsill
  • Sow coriander directly outdoors

Keep your kitchen garden productive by sowing salad leaves regularly throughout May.

Top varieties to grow include:

  • Lettuce
  • Rocket
  • Spinach
  • Mixed salad leaves

👉 Top Tip: Sow small batches every 2–3 weeks to ensure a continuous harvest all summer long.

For best results:

  • Choose a sunny or lightly shaded spot
  • Keep soil consistently moist
  • Harvest young leaves for better flavour and faster regrowth

 

9. Get Ahead with Winter Vegetables

Start planning ahead by sowing:

  • Kale and Winter Cabbbage (indoors or in a greenhouse)
  • Parsnips, Brussels sprouts and Leeks (outdoors)

💧 Watering with Efficiency

10. Water Smartly

Water regularly during early morning or evening to reduce evaporation.

Improve efficiency by:

  • Watering soil, not leaves
  • Installing a water butt for rainwater collection

👉 Rainwater is naturally better for plants than tap water.

🌱 Weed Control & Garden Maintenance

11. Stay on Top of Weeds

Weeds grow rapidly in May.

  • Hoe regularly on dry days
  • Remove deep-rooted weeds with a hand fork

👉 Pro Tip: Mulching beds helps suppress future weed growth.

12. Trim Hedges Responsibly

Before cutting hedges:

  • Check carefully for nesting birds

⚠️ It is illegal to disturb nesting wildlife so always inspect first.

✂️ Pruning for Healthy Growth

13. Prune Spring-Flowering Shrubs

Once flowering finishes, prune:

  • Forsythia
  • Flowering currants
  • Chaenomeles
  • Choisya

Cut back flowering stems and remove dead or older wood to promote fresh growth.

14. Prune Early Clematis (Group 1)

Now is the time to trim early-flowering clematis such as:

  • Clematis montana
  • Clematis armandii

Cut back as needed to maintain size and shape.

🪴 Container Care

15. Feed & Water Container Plants

Container plants dry out quickly, even in wet weather. Light rain and short showers are unlikely to wet the compost more than a few centimetres down, so watering may still be needed even if it has rained recently.

  • Water regularly
  • Feed every two weeks with a balanced liquid fertiliser

👉 Expert Tip: Group pots together to reduce moisture loss.

🌿 Visit Our Garden Centre

From vibrant bedding plants and vegetable seedlings to compost, tools, and expert advice, we’ve got everything you need this season.

👉 Visit us in Kington today and let us help you create a garden you’ll love all summer long.