• home
  • posts
  • fruit vegetable growing guide may
  • Posted April 30th, 2017

    Fruit & vegetable growing guide for May

    Fruit & vegetable growing guide for May

    Generally one of the busiest months on the vegetable plot, here John Harrison shares his fruit and vegetable growing guide for May. The soil is warm and the plants growing well. But watch out for a sneaky late frost. Keep an eye on the weather forecast and be prepared for frantic last minute wrapping of fleece to protect tender plants.

    If you do not have any horticultural fleece you can use old net curtains, bubble wrap and the traditional newspaper as a method of insulation when a cold night is forecast.

    Sowing & planting in May on the vegetable plot


    There are two main cultivation jobs you need to keep on top of in May. First, the weeds are growing. Hoeing them off as small seedlings will make the job far easier than waiting for them to grow and send their roots down. Hoeing is best done on a dry day so that the weeds do not have a chance to recover. Don’t forget to sharpen your hoe before you start and frequently as you use it.

    The other cultivation job outdoors is to thin out. We sow our carrots and parsnips and it seems a shame to remove seedlings we were so happy to see appear but it needs to be done because we need to give each one space to develop rather than end up with a mass of tiny carrots.

    The same applies to most crops that are direct sown with small seeds, like turnips, beetroot etc.

    Beans wrapped in bubble wrap to protect from a sudden mid-May frost.


    There is a lot to sow this month and with many crops you can sow one set and then a few weeks later re-sow to give you a succession of fresh vegetables at the peak of perfection. If it is a dry May, it is a good idea to soak your seed drill before sowing and then just water with a fine rose after sowing and covering with a fine layer of soil.

    Sowing under cover

    These really don’t like starting in the cold and you only grow a relatively few plants so starting off in pots is well worth the investment.

    Sweetcorn does not like its roots being disturbed so some people pack old toilet roll inners with compost and sow in there, planting out the whole roll when ready. Because you are in a cardboard pot, they can dry out very easily and you need to ensure they are planted with the whole roll below ground level or the collar will encourage drying out and restrict growth. It is easier to use something like root trainers although an ordinary three inch pot will suffice if care is taken at planting time.

    Planting out

    If your plants are large enough, you can plant out now:

    • Brussels sprouts
    • Summer cabbages
    • Celery
    • Celeriac
    • Leeks.

    With leeks a good rule of thumb is to get the seedling about as thick as a pencil. Dib a hole about six inches deep using something like an old spade handle and drop the seedling in. Water well and allow the soil to fall back in naturally.

    The old method of trimming the roots and top before transplanting leeks is not actually a good thing and has been shown to be detrimental. It’s a big enough shock to the plant being taken out of its seedbed!

    In the greenhouse

    The following are ready for their final home, that may be the border, a growbag or a large pot.

    • Aubergine
    • Peppers (Chilli and Sweet)
    • Cucumber
    • Tomatoes


    It’s mainly a matter of ensuring that you get the crops rather than the birds. A fruit cage is a big investment but very effective, otherwise netting to keep the birds away.

    Strawberries planted this year will perform better in subsequent years if you remove the flowers so they don’t set fruit in the first year but concentrate instead on building their strength for next.

    Allotment in May sunshine.

    General tasks

    Keep hoeing off the weeds but perennial weeds like dandelion and dock will need their roots removing to prevent re-growth.

    Organic growers will just need to keep hoeing and removing roots. This will eventually defeat the weed but it’s a long, hard job.

    Gardener’s pests

    Don’t forget the slugs are about, if you find an entire row of seedlings have vanished overnight you can bet it was slugs.

    With your carrots, covering with a fleece and ensuring the edges are buried will stop the carrot root fly from gaining entry to lay eggs by your carrots. The eggs hatch in larvae that burrow into the carrot root, killing the plant or at least spoiling the crop.


    Depending where you are and what you planted, you may have some salad crops ready. Hardy lettuce and spring onions, fast growing radish may well be available.

    If you tried potatoes undercover, you may well be getting the odd meal from these.

    Winter cauliflowers, spring cabbage, sprouting broccoli and kale should be ready now.

    The luxury crop asparagus may be starting for you as well this month. Unbeatable!

    You can get John’s book Vegetable Growing Month-by-Month here.

    The views expressed in our blog are those of the author and not necessarily lowimpact.org's


    • 1Suzy Russell May 3rd, 2023

      Appalled that you even suggest glyphosate in this mailing...surely the detrimental effects are well enough documented by now. Glyphosate is not low impact! And many weeds (plants in the wrong place) are hugely benenficisl for pollinatirs...which given proceding article should be top of the list!

    • 2Dave Darby May 4th, 2023

      Suzy - absolutely! I've removed reference to pesticides. As it says at the bottom of the article: 'The views expressed in our blog are those of the author and not necessarily lowimpact.org's' - and this is an old article - so the glyphosate references obviously slipped through. We've blogged about the horrors of glyphosate - https://www.lowimpact.org/posts/recent-findings-on-glyphosate-and-why-we-dont-need-gm-food. Thanks for letting us know.

    • 3Good Gardeners International May 5th, 2023

      With the HH-2 system of compost making you don't need anything to stop the slugs, snails or caterpillars or carrotfly, blackfly greenfly etc.,

      available from us https://ggi.org.uk/shop/

    Leave a comment

    We welcome questions.

    There’s a crash coming – a slap from Mother Nature. This isn’t pessimistic; it’s realistic.

    The human impact on nature and on each other is accelerating and needs systemic change to reverse.

    We’re not advocating poverty, or a hair-shirt existence. We advocate changes that will mean better lives for almost everyone.

    Sign up to our newsletter

    Facebook icon Twitter icon Youtube icon

    All rights reserved © lowimpact 2023