Spring Gardening Checklist: 15 Essential Tasks for March, April and May — in the Right Order
A comprehensive spring gardening checklist covering the 25 most important tasks for March, April and May. Month-by-month guide for UK gardeners to get the best from their garden this spring.
Spring Gardening Checklist: 25 Essential Tasks for a Thriving Garden
Spring is the most important season in the gardening calendar. After months of cold and dormancy, the garden bursts back to life — and the actions you take in March, April and May directly determine how your garden performs for the rest of the year. Miss a key task and you may spend summer fighting weeds, battling pests, or wondering why your roses look thin and your lawn has bare patches.
In the UK, spring arrives unevenly. A mild February can tempt you outside early, but frosts can return well into May in northern England and Scotland. This checklist is structured month by month so you know exactly what to prioritise and when — based on the UK climate and Royal Horticultural Society (RHS) seasonal guidance.
Why Timing Matters in Spring Gardening
The UK sits in USDA hardiness zones 7–9, with coastal and southern gardens warming fastest and northern and elevated areas remaining colder into late spring. The last frost date varies from mid-March in the South West to mid-May in parts of Scotland and the Pennines. Planting tender crops or moving half-hardy plants outside too early is one of the most common spring mistakes.
Equally, waiting too long means you miss the window for early sowings, lose the benefit of moist spring soil, and let weeds establish before your plants do. The checklist below gives you the right tasks at the right time.
For more on this topic, see our guide: Autumn Gardening Checklist: 20 Essential Tasks for September, October & November.
For more on this topic, see our guide: Summer Gardening: Essential Tasks for June, July & August.
March Gardening Tasks
March is about preparation and early action. The soil is beginning to warm, but conditions can change rapidly. Focus on structure, feeding, and getting seeds started under cover.
1. Prune Roses
March is the ideal month to prune bush roses (hybrid teas and floribundas) in most of the UK. Cut back to healthy outward-facing buds, remove any dead or crossing branches, and aim for an open goblet shape that allows air to circulate. Read our full roses care guide for pruning depths and variety-specific advice.
2. Start Seeds Indoors
Tomatoes, peppers, aubergines, and slow-growing flowers like antirrhinums and petunias need 8–10 weeks indoors before outdoor planting. Start them in a heated propagator at 18–21°C for reliable germination. Use seed compost rather than general-purpose mix — its fine texture and low nutrient level promotes root development without scorching seedlings.
3. Feed the Lawn
Apply a spring/summer lawn feed in mid-to-late March once the grass has started actively growing. Look for a formulation high in nitrogen (the first number in the NPK ratio) to promote lush green growth. Avoid feeding in cold snaps as the nutrients won’t be absorbed and can run off into waterways.
4. Tidy Borders
Remove last year’s dead stems and leaves that have been left over winter for wildlife. Cut back ornamental grasses before new growth emerges from the base. Rake out moss and thatch from the lawn. Edge borders with a half-moon edging tool for a clean, defined look that will last through the season.
5. Apply Mulch
Once the soil has begun to warm (but while it’s still moist), apply a 5–7cm layer of well-rotted garden compost, bark chippings, or leaf mould around border plants. Mulching in March suppresses early weed growth, retains moisture, and slowly feeds the soil as it breaks down. Keep mulch away from plant stems to prevent rot.
6. Check for Slugs and Snails
Slugs and snails are among the first pests to become active in spring. Check under debris, stones, and low-growing foliage for egg clusters. Use wildlife-safe ferric phosphate pellets around vulnerable plants, or set beer traps. Encouraging hedgehogs and frogs into your garden provides natural long-term control.
7. Plant Onion Sets and Shallots
March is the classic time to plant onion sets and shallots directly in the ground in the South and Midlands. In colder areas, wait until April. Space sets 10cm apart in rows 30cm apart, pushing them into well-worked soil with just the tip visible. Cover with netting if birds are a problem.
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8. Divide and Replant Snowdrops
Snowdrops are best divided and replanted ‘in the green’ — immediately after flowering while leaves are still present. Dig up clumps, separate them gently, and replant in groups of 3–5 bulbs in dappled shade with moisture-retentive soil. This is far more successful than planting dry bulbs in autumn.
April Gardening Tasks
April brings warmer temperatures and longer days. The garden is coming alive rapidly and there’s more to do than any other month. Prioritise planting, dividing, and preparing beds for summer.
9. Plant Summer Bulbs
Dahlias, gladioli, begonias, and cannas can be started in pots under cover in April and planted out after the last frost. Plant dahlia tubers directly into the ground in mid-April in southern England (wait until May further north). Planting in April rather than May gives you an earlier and longer display.
For more on this, see container gardening guide: pots, compost.
10. Harden Off Seedlings
Seedlings started indoors in March must be gradually acclimatised to outdoor conditions before planting out. Place them in a cold frame or sheltered spot during the day and bring inside at night. After 7–10 days of this ‘hardening off’ process, they’ll be ready to plant with significantly less transplant shock.
11. Divide Perennials
April is ideal for dividing most herbaceous perennials — hostas, geraniums, sedums, and rudbeckias all benefit from being lifted and split every 3–4 years. Use two forks back-to-back to prize large clumps apart, discard woody centres, and replant the healthiest outer portions. Hostas in particular respond brilliantly to division, producing vigorous new growth from healthy sections.
12. Sow Hardy Annuals Direct
Calendulas, cornflowers, nigella, and nasturtiums can be sown directly into prepared beds in April. Rake the soil to a fine tilth, scatter seeds, and rake gently to cover. Thin seedlings once they reach 5cm. Direct-sown hardy annuals often outperform transplants as they develop deeper roots from the start.
13. Plant Asparagus Crowns
April is the optimum time to plant asparagus crowns. Prepare a dedicated bed with well-drained, deeply dug soil enriched with organic matter. Plant crowns 30–45cm apart in trenches 20cm deep, spreading roots carefully. You’ll need to wait two years before harvesting, but a well-established asparagus bed produces for 20 years or more.
14. Feed Roses and Shrubs
Apply a specialist rose fertiliser or general balanced feed (such as Growmore or fish, blood, and bone) to roses and flowering shrubs in April, just as new growth accelerates. Feeding at this stage supports the development of the season’s first flush of flowers. Follow with a high-potassium feed in June to promote further flowering.
We cover this in more depth in what to plant in spring.
15. Mow the Lawn Regularly
Once the grass is actively growing (usually early-to-mid April), begin mowing weekly. Set the blade high for the first cuts — around 4cm — and lower gradually through the month. Never remove more than a third of the grass length in a single cut. Regular mowing from April onwards produces a denser, weed-suppressing sward.
16. Plant Potatoes
First early potatoes can be planted in the South from late March; second earlies and maincrops go in during April across most of the UK. Plant tubers 12cm deep and 30cm apart in rows 60cm apart. Earth up as shoots emerge to protect from late frosts and increase the yield of tubers.
May Gardening Tasks
May is the crescendo of spring — the garden is lush and growing fast. The focus shifts to planting tender crops after the last frost, supporting plants, and getting ahead of summer maintenance.
For more on this, see spring pruning guide: which plants.
17. Plant Tender Vegetables After Last Frost
After your local last frost date (typically mid-May in most of England and Wales; late May in Scotland and exposed upland areas), you can safely plant out tomatoes, courgettes, cucumbers, French beans, and sweetcorn. Planting into cold soil stunts growth — wait until the soil temperature reaches at least 10°C for best results.
18. Deadhead Spring Bulbs
Remove faded tulip and daffodil flowers to prevent energy being diverted into seed production. For tips on getting the best from your bulbs next year, see our complete guide to planting spring bulbs. However, leave the foliage intact for at least six weeks after flowering — the leaves are photosynthesising and returning energy to the bulb for next year’s display. Tying leaves into knots or cutting them too early significantly weakens next year’s flowers.
19. Stake Tall Plants
Delphiniums, dahlias, peonies, and tall ornamental grasses need staking before they fall rather than after. Use bamboo canes and soft twine, or install purpose-made plant supports. Stake when plants reach about 30cm — much easier than trying to prop up a mature plant that’s already toppled. Position stakes to be barely visible once the plant fills out.
20. Plant Hydrangeas
May is an excellent time to plant hydrangeas — the soil is warm, moisture levels are good, and plants have the entire growing season to establish. Choose a position with morning sun and afternoon shade for best performance. Our hydrangeas guide covers planting, soil pH (which affects flower colour), and feeding in detail.
21. Plant Lavender
Lavender thrives when planted in May once the risk of frost has passed. It demands well-drained, lean soil and full sun. Avoid enriching the soil before planting — lavender in overly fertile ground produces lush, floppy growth and fewer flowers. See our lavender guide for variety selection and pruning schedules.
22. Thin Fruit
Apples, pears, and plums often set more fruits than they can support to maturity. Thin fruitlets in late May/early June — remove the central ‘king fruit’ from each cluster and then thin remaining fruits to one every 10–15cm. Counter-intuitive as it feels, removing excess fruitlets results in larger, better quality, and healthier fruit.
23. Start Regular Watering Routines
By May, newly planted specimens and seedlings may need watering if dry spells occur. Water deeply and infrequently rather than little and often — this encourages deep root growth. Water at the base of plants in the morning to reduce evaporation and prevent foliar diseases. Set up water butts if you haven’t already to capture rainfall.
24. Weed Weekly
Annual weeds germinating in spring are easiest to remove when tiny. A weekly 10-minute hoe session prevents weeds from establishing root systems and reaching the point where removal is laborious. Weed little and often — it’s far more time-efficient than tackling established weeds later in the season.
25. Prepare Hanging Baskets and Container Displays
Plant up hanging baskets and containers with bedding plants in mid-May (in frost-free areas) or keep in a cool greenhouse until after last frost. Use a peat-free compost with good water retention and add slow-release fertiliser granules at planting time for a season-long feed. Plant densely for an instant full look.
Essential Spring Tools Checklist
Before diving into spring tasks, check that your tools are clean, sharp, and ready. A poorly maintained tool makes every job harder.
- Spade and border fork — clean off old soil, oil metal parts with linseed oil
- Hand fork and trowel — essential for close-up planting and weeding
- Secateurs — sharpen with a whetstone; sterilise with methylated spirit between plants
- Loppers — for branches too thick for secateurs (over 1.5cm diameter)
- Hoe — Dutch or draw hoe for surface cultivation and weed control
- Rake — for soil preparation and lawn care
- Watering can or hose with adjustable nozzle — gentle rose head for seedlings
- Kneeler or knee pads — protect joints during prolonged ground-level work
- Garden twine and stakes — bamboo canes in various lengths
- Wheelbarrow — for moving compost, mulch, and garden waste
Common Spring Gardening Mistakes to Avoid
- Planting out too early — always check your last frost date and soil temperature before moving tender plants outside
- Cutting back bulb foliage too soon — removing leaves while still green starves bulbs for next year
- Over-feeding in cold conditions — nutrients won’t be absorbed and can leach into waterways
- Skipping hardening off — seedlings moved from indoors to outdoors without acclimatisation suffer transplant shock and setback
- Mulching cold, dry soil — mulch should be applied to warm, moist soil to be effective
- Neglecting to sterilise tools — spreading rose black spot, fireblight, and other diseases through dirty secateurs is avoidable
- Mowing wet grass — causes ruts, tears the grass, and clogs the mower
Frequently Asked Questions
When should I start gardening in spring in the UK?
You can begin light tasks such as tidying borders, pruning roses, and starting seeds indoors from early March. More active planting begins in April as soil temperatures rise, with the main planting season for tender crops running from mid-to-late May after the last frost.
What should I do in the garden in March?
March priorities include pruning roses, feeding the lawn, starting tomatoes and peppers indoors, applying mulch to borders, dividing snowdrops in the green, and planting onion sets. Focus on preparation and structure rather than planting tender plants.
When is it safe to plant tender vegetables outdoors in the UK?
In most of England and Wales, after the 15th of May is generally considered safe. In the North of England, last frosts can occur into late May. Scotland and elevated areas may not be frost-safe until early June. Always check local frost forecasts before planting out.
How do I know when the soil is ready to work in spring?
Soil is ready when it no longer sticks to your boots and you can compress a handful and it crumbles rather than staying as a muddy ball. Working wet, compacted soil damages its structure. If in doubt, wait another week — a few days’ delay is better than damaging your soil for the season.
What is the most important spring gardening task?
If you can only do one thing, apply mulch to your borders in March or early April. Mulching suppresses weeds, retains moisture, improves soil structure, and feeds your plants — giving you a better garden for less effort throughout the entire season.
Sources
- Royal Horticultural Society. Spring gardening jobs. RHS. https://www.rhs.org.uk/advice/seasonal-advice/spring-gardening-jobs
- Royal Horticultural Society. When to sow seeds. RHS. https://www.rhs.org.uk/advice/profile?pid=522
