Jobs to do in the garden in May – prepping veg plots, planting hanging baskets and nurturing lawns

It's a very busy time of year for gardeners – and one full of reward!
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  • It’s spring! The sun is out and recent showers have given gardens the boost needed to get growing, so now is the time to do a bit of prep work to reap the benefits all summer.

    ‘As the weather warms, it’s a great month to plant your patio containers, hanging baskets and window boxes with summer bedding plants’ explains Marcus Eyles, resident gardening expert and horticultural director at Dobbies.

    ‘These will put on a fabulous display of floral colour until the frosts return in the autumn. It’s never too late to get planting and growing, but for a long season of colour and blooms on your doorstep, May is the ideal time to get underway if you haven’t already.’

    Seeds should be sown, vegetables and flowers should be planted, and lawns should be given some tender loving care to ensure they are looking luscious and well-nourished for sunny days spent outdoors.

    Visit our garden ideas channel for more inspiration

    Jobs to do in the garden in May

    But with so much to do in the garden in May, what is top of the priority list? Marcus shares his gardening jobs of the month, helping you to get one step closer to your dream garden.

    Here’s your May garden to-do list…

    1. Prep your pots

    jobs to do in the garden in may

    Image credit: Tim Young

    Plant up your outdoor pots and summer hanging baskets, but keep them in a greenhouse or porch for a few weeks to establish, before putting them outside. ‘Depending on your location, tender bedding plants such as Cannas and Dahlias can be planted out towards the end of the month, but you should remain vigilant of any late frosts and protect accordingly’ Marcus warns.  ‘Colder areas may be wise to wait until early June, or until all risk of frost has passed.’

    ‘Bedding plants raised from seed can now be hardened off in a cold frame over a period of 7 to 10 days before planting out. Establishing the plants encourages roots to grow out and increase their drought tolerance which means they will be able to withstand the drier months ahead.’

    ‘Remember to feed containers and hanging baskets fortnightly with a liquid fertiliser, as per the manufacturer’s instructions, to keep them healthy and looking their best’ advises Marcus.

    2. Sow vegetable crops

    jobs to do in the garden in may

    Image credit: Mark Bolton

    ‘Most vegetable crops can be sown now. With quick growing crops such as salads and Spinach, repeat sow every 10 days to ensure a consistent supply of fresh leaves’ advises Marcus.  Start sowing runner, dwarf and climbing French beans.

    All beans appreciate a rich, deep, well-drained soil in a sunny position, so before sowing make sure you dig over your plot to clear any rocks and large stones, and dig in a good amount of compost or well-rotted farmyard manure to encourage the beans to grow.

    3. Mulch beds and borders

    Jobs to do in the garden in May

    Not only does mulching lock in the soil’s moisture and improve its texture, it also works to suppress weeds. ‘Warmer temperatures will herald the appearance of weeds. The quickest and easiest way to control them is to hoe them off before they get chance to get established, applying a thick layer of mulch over the soil surface to help keep any further weeds at bay’ explains Marcus. ‘Mulching with organic matter, such as farmyard manure, also locks in moisture and, over time, helps to improve your soil, whilst giving plants a well-needed boost.’

    By covering the soil with mulch, weed seeds struggle to come into contact with the soil when they land; this, combined with their deprivation of light means they cannot germinate and are prevented from growing. Make sure you apply enough mulch (around 2-3 inches) and ensure that the mulch is not pushed too closely up against your plants.

    Further ideas: Easy garden ideas – simple updates to transform your outdoor space

    4. Quench crops’ thirst

    Jobs to do in the garden in May

    Image credit: Annaick Guitteny

    Now that the weather is warming up it’s important to water thirsty crops such as tomatoes, cucumbers and courgettes regularly. Make sure that the soil or compost stays moist but is not waterlogged and take care to water the ground around the plant and not the leaves.

    5. Preserve future flowering with deadheading

    Image credit: Amateur Gardening

    ‘Deadhead clumps of daffodils and tulips, so that energy is concentrated back into the bulb for next spring’ says Marcus. ‘Leave the foliage in place to die back naturally as this feeds the bulbs.’

    ‘Wallflowers and early spring bedding will be starting to fade now, so remove tired plantings, adding them to the compost heap, to make way for fresh summer displays. Prune early spring flowering shrubs such as Chaenomeles, Forsythia and Ribes after flowering, if required. More tender late summer flowering shrubs such as Caryopteris, Perovskia and hardy Fuchsias can also be trimmed now, if they need it.’

    6. Be vigilant of pests!

    cottage garden outdoor potting bench

    Image credit: Rachel Whiting

    It’s important to check plants regularly for pests. Pay close attention to shoot tips to check for pests, such as capsid bugs, as well as the underside of leaves which can attract aphids, mealy bugs, red spider mites and thrips. There are plenty of ways to ward off those unwanted pests in an eco and wildlife friendly way without causing damage to your plants.

    ‘Protect young seedlings from slugs. For non-chemical control, apply nematodes to the surrounding soil as an effective organic control’ suggest Marcus.

    7. Tend to the lawn

    Image credit: Rachel Smith

    Apply nitrogen-rich summer feed to your lawn to encourage leafy growth. May is the best time of year to do this as the longer daylight hours and warmer soil create the perfect conditions for the grass to grow. Always fertilise your lawn after mowing to avoid disturbing the fertiliser on the surface.

    ‘Regular weekly mowing is best for a healthy lawn, mixing the clippings into your compost heap’ Marcus suggests. ‘Early May is an ideal time to sow new lawns, or repair bare patches, on ground that has been pre-prepared, levelled and firmed. Alternatively, for quicker results, lay new turf. Whichever method you choose, be sure to keep it well watered, and avoid walking on it for a few weeks to allow time for new roots to establish themselves.’

    Related: Lawn care tips – expert ideas for healthier grass and improved turf

    7. Grow beautiful Foxgloves

    Jobs to do in the garden in May

    Image credit: Annaick Guitteny

    ‘This month, cottage garden plants are growing madly and filling borders with their vigorous growth’ says Marcus. Tall, striking and graceful, foxgloves are one such example – the perfect plant for the back of a border in dappled shade. While they prefer moist soil, they will tolerate a dry spot, especially if you give them a generous mulch of dried bark in spring. Growing up to 2m, they look stunning grown alongside a hedge or in a circle around a specimen tree.

    These plants are generally biennial, which means they grow their leaves in the first year then flower in the following year. However, they set seed very freely, so new plants are likely to keep popping up in the same position. If seedlings appear where they’re not wanted, wait until they are around 10cm tall before you transplant them to a more suitable spot. The new plants may be different colours to the parents which can lead to some exciting discoveries!

    Read more here: Cottage garden ideas – create a charming country-style garden in any setting

    Will you be tackling any of these May gardening jobs?

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