May is the month everything changes. The evenings stretch out, the soil finally warms up and the garden goes from tentative spring growth to full-tilt summer in the space of a few weeks. It’s also the best month of the year to get children genuinely hooked on growing things because in May, results happen fast enough to hold their attention.
This is your complete checklist of gardening jobs for May in Ireland, from what to sow, to what to plant out, to what to maintain and how to involve children meaningfully in each one. Whether you have a full garden, a balcony or just a few windowsill pots, there’s something here for you.
If you’d love seasonal growing and nature activities delivered to your door each month, our Little Sprouts monthly nature box includes seeds, growing guides, nature activities and Irish folklore stories for children aged 3–9.
May Garden Checklist at a Glance
Use this as your month’s quick reference. The detailed jobs follow below.
| Sow | Plant out | Maintain |
| Sow sunflowers directly outdoors | Harden off indoor seedlings | Protect against slugs — peak season |
| Sow runner & French beans outside | Plant out courgettes (late May) | Earth up potatoes as they grow |
| Direct sow carrots, beetroot, rocket | Move tomatoes outdoors (late May) | Feed containers every 2 weeks |
| Sow cornflowers & cosmos |
Plant summer bedding |
Deadhead spring bulbs (don’t cut leaves) |
| Start basil indoors on warm windowsill | Sow basil & herbs outdoors (late May) | Weed little and often — much easier now |
|
Final broad bean sowings |
Thin out seedlings as needed | Mow lawn regularly, raise blade slightly |
One important Irish note: Frost risk in Ireland is mostly passed by mid-May, but inland areas and higher ground can still see late frosts until the end of the month. Always check your local forecast before planting out tender seedlings.
Sowing Jobs for May
1. Sow sunflowers directly outdoors
May is the ideal month to sow sunflowers directly outside in Ireland. The soil is warm enough for fast germination and you’ll see shoots within 7–10 days. Push seeds 2.5cm deep in a sunny spot and water well. For families without a garden, dwarf varieties like Teddy Bear or Sunspot grow brilliantly in large pots on a balcony or sunny windowsill.
Get the kids involved: Let children make the hole with their finger, drop the seed in and cover it. Set up a weekly measurement chart on the wall. Measuring the sunflower every Monday becomes a ritual they look forward to all summer.
2. Sow runner beans and French beans outside
Both runner beans and French beans can go directly into the ground or into large pots in May. Push two seeds 5cm deep, 15cm apart, at the base of a bamboo support. Runner beans need something to climb, such as a teepee of canes, a fence or a trellis. They’re one of the most productive crops you can grow in an Irish garden, cropping abundantly from July through September.
Get the kids involved: Build a bean teepee together from bamboo canes and string before sowing. Children feel real ownership over a structure they helped make, and even more pride when pods appear on it. Picking fresh pods straight from the plant is one of the best summer moments in any family garden.
3. Direct sow carrots, beetroot and rocket
These three can all go directly into prepared soil or deep containers in May.
- Carrots need light, stone free compost. Grow them in a deep pot if your soil is heavy.
- Beetroot is remarkably easy and the seeds are large enough for small hands to handle.
- Rocket is the fastest return of any vegetable you can grow and you’ll be cutting leaves in 4–6 weeks.
Irish tip: Protect carrot seedlings from carrot root fly with a fine mesh cover or grow them in containers away from the soil. This is a significant pest in Ireland and easily avoided with the right precautions.
Get the kids involved: Scattering tiny carrot seeds along a drill is genuinely satisfying for children. The covering and patting down that follows is deeply tactile. Mark each row with a seed packet on a stick so they know exactly what’s growing where.
4. Sow cornflowers, cosmos and nasturtiums
May is your last reliable window for sowing cornflowers to guarantee summer blooms. Scatter seeds directly where you want them to flower. They don’t like being transplanted. Cosmos and nasturtiums can go in now too. All three are low maintenance, loved by pollinators and produce flowers children can cut, press and use in craft projects all summer.
Get the kids involved: Give each child their own small patch of ground or pot and let them scatter a packet of mixed wildflower or cosmos seeds. The ‘chaos gardening’ approach through scattering and seeing what comes, is a brilliant low pressure introduction to growing for children who find structured planting overwhelming.
5. Start basil indoors
Basil needs more heat than an Irish May reliably provides outdoors, so start it on the warmest windowsill in the house. The kitchen is usually ideal. Sprinkle seeds onto the surface of moist compost, press lightly, and cover with a thin layer of vermiculite or compost. Keep warm and moist. It’ll germinate in 7–14 days and be ready to harvest in 6–8 weeks.
Irish tip: Don’t rush basil outside. It sulks in cool temperatures and Irish evenings are still chilly in May. Keep it inside until at least early June, then move gradually to a sheltered outdoor spot.
Planting Out Jobs for May
6. Harden off indoor seedlings
If you started tomatoes, courgettes, cucumbers or sweet corn indoors in March or April, May is the month to gradually acclimatise them to outdoor conditions, a process called hardening off. Place seedlings outside in a sheltered spot for a few hours each day, gradually increasing exposure to sun, wind and rain over 1–2 weeks. By late May they’ll be ready to plant out permanently.
Get the kids involved: Give children responsibility for the daily ‘moving outside and back in’ routine. It’s a small, manageable job that builds a genuine sense of plant care and daily connection to the growing process.
7. Plant out courgettes (from late May)
Courgettes are one of the most rewarding plants to grow with children. One or two plants will produce more courgettes than most families can eat from July through September. Plant out hardened-off seedlings from late May once frost risk has passed. Give each plant plenty of space (at least 60–90cm) or grow in a large container or grow bag.
No garden? Courgettes do very well in large containers or grow bags on a sunny balcony. A 40–50 litre pot is ideal. Water generously once established as courgettes are thirsty plants.
Get the kids involved: Let children harvest their first courgette with a pair of children’s scissors and cook it the same day. Grated into pasta, sliced on homemade pizza or fried in butter with garlic. The connection between growing and eating is where the real magic happens.
8. Move tomatoes outdoors (late May, sheltered spots)
Tomatoes can move outside from late May in sheltered, south-facing spots in Ireland. Coastal and southern areas first, inland and northern areas at the very end of May or early June. Grow bags and large containers work brilliantly on patios, balconies, and against warm south-facing walls. Stake plants as they grow and pinch out side shoots on cordon (tall) varieties to keep energy focused on fruit.
Get the kids involved: Children are endlessly fascinated by the transformation from flower to fruit. Point out the yellow flowers when they appear and ask children to check daily for the first tiny green tomatoes. The anticipation builds beautifully over weeks.
9. Plant summer bedding
Once frost risk is reliably past in your area (mid-to-late May for most of Ireland), summer bedding plants such as petunias, geraniums, begonias, marigolds and lobelia can go into hanging baskets, window boxes, and borders. Marigolds are particularly useful planted alongside vegetables as they deter aphids and attract beneficial insects.
Get the kids involved: Let children choose one plant each for a pot of their own at the garden centre. Having full ownership of a single container, from choosing it, planting it and watering it, creates a level of engagement that shared family garden beds rarely match.
Maintenance Jobs for May
10. Protect against slugs — it’s peak season
May is peak slug season in Ireland. Warm, damp soil and tender young seedlings are a perfect invitation. The most effective organic approaches are going on regular slug hunts (especially after rain or in the early morning), copper tape around pot rims, beer traps sunk into the soil, and encouraging natural predators including frogs, hedgehogs, ground beetles and birds all help. Eggshells and grit around seedling bases are worth trying for young plants.
Get the kids involved: Turn slug patrol into an adventure rather than a chore. Evening or early morning slug hunts with a torch are genuinely exciting for children aged 4–10. Give them a collection bucket and a mission. Relocate slugs to a compost heap or hedge rather than handling them if that’s preferred
11. Earth up potatoes
As potato foliage emerges, draw soil up around the stems (a process called earthing up) to protect developing tubers from light (which makes them green and inedible) and from late frosts. Repeat every 10–14 days as the plants grow. You’re building a mound rather than covering the plant completely, just the lower stems need covering.
Get the kids involved: Earthing up is excellent sensory work for children including scooping and moving soil with a trowel or their hands. Ask them to look out for any tiny potatoes appearing near the surface that need covering. The reveal at harvest time makes all this work feel worthwhile.
12. Feed container plants
Once plants in pots and containers are actively growing, they need regular feeding, unlike garden soil, containers have a finite amount of nutrients that gets exhausted quickly. A liquid seaweed feed or tomato feed every two weeks makes a visible difference. Start feeding when you see consistent new growth and continue until the end of the season.
13. Thin out seedlings
As seedlings sown earlier in spring grow on, thin them to the recommended spacing on the seed packet. It feels counterintuitive to remove healthy plants, but thinning prevents overcrowding, improves airflow, and gives remaining plants the space and nutrients to thrive. The thinnings from beetroot, lettuce and radish are often edible, wash and add to salads.
Get the kids involved: Explain to children that thinning is like giving the plants more room so they can grow bigger and stronger. It's similar to giving people more space in a busy room. The concept of intentional removal for a better outcome is a genuinely useful lesson beyond the garden.
14. Weed little and often
May weeds grow fast in warm, moist soil. The trick is not to let them get ahead of you. Ten minutes of weeding every few days is infinitely easier than an hour of clearing established weeds every few weeks. Hoe between rows on dry days so disturbed weeds wither in the sun rather than re-rooting. Mulching around plants with compost or bark suppresses weeds and retains moisture simultaneously.
15. Watch for the May harvest
May is a gap month for Irish harvests. Winter crops are finished and summer ones aren’t ready yet. But there’s still plenty to pick. Asparagus (if established), rhubarb, spring cabbage, overwintered spinach and lettuce, radishes, and spring onions are all available now. Early sown rocket might be ready for its first cut. And if you’re lucky enough to have roses, peonies, or alliums, cut them and bring them indoors.
Get the kids involved: The harvest, however small, is always the most exciting moment for children. Even pulling a handful of radishes or cutting a few rocket leaves is a genuine reward. Involve children in washing, preparing, and eating whatever comes out of the garden this month, even if it’s just a small salad.
May Gardening Without a Garden
No outdoor space? May is still one of the best months for container growing. Sunflowers, runner beans, rocket, basil, cornflowers, and courgettes can all thrive in pots on a balcony or a sunny windowsill. See our full guide to gardening without a garden for Irish families for everything you need to know about small space growing.
Common Questions About May Gardening in Ireland
When is it safe to plant out tender plants in Ireland in May?
From mid-May onwards for most coastal and southern areas of Ireland. Inland areas, the midlands, and higher ground should wait until the last week of May or early June to be safe from late frosts. Always check your local forecast, a single unexpected frost can wipe out tender plants overnight.
What’s the fastest thing to grow with kids in May?
Rocket wins, you’ll be harvesting leaves in 4–6 weeks from sowing. Radishes are even faster (3–4 weeks) and children love pulling them from the ground. Cress on a wet paper towel is the classic instant gratification option and works at any age from about 2 upwards.
Do I need to water every day in May?
Freshly sown seeds and newly planted seedlings need consistent moisture while establishing. Check the soil every day and water if the top inch feels dry. Once plants are established, ease back to every 2–3 days in the garden. Containers dry out faster than garden soil and often need daily watering in May, particularly on windy days.
How do I stop slugs eating my seedlings in May?
The most reliable organic approach is regular slug patrols after rain or in the early morning, combined with copper tape around pots. Beer traps work well in beds. For precious seedlings, a cloche or mesh cover overnight provides reliable protection. Encouraging frogs, hedgehogs and ground beetles into your garden by providing habitat helps reduce the population over time.
Make the Most of May
May is short. Blink and it’s June. But the seeds you sow and the plants you put in the ground this month will feed your family, fill your garden with colour and give your children growing experiences they’ll remember through the summer. It doesn’t need to be a big or complicated undertaking. One pot of sunflowers and a row of rocket is enough to make May feel like a success.
For a full guide to everything you can sow and plant this month, see our post on what to plant in May in Ireland. And if you’d love a monthly dose of seeds, nature activities, and Irish folklore stories delivered to your door, take a look at the Little Sprouts Garden Box, designed for families with children aged 3–9, no garden required.