What to do in the garden in May
The birds are singing, tulips are blooming — weeds are growing — and May’s arrival midweek means getting outside and kicking it all into high gear.
We start the month yanking out those weeds, and end it planting crops and spreading mulch.
But there’s so much to do in between. Here’s a tip or chore for each day of the month.
1. Incorporate generous helpings of compost into beds and boarders before planting.
2. Fertilize cabbage, lettuce, spinach and other cool-season vegetables.
3. Start planting perennials.
4. Repot overgrown houseplants into the next-size pot (5 centimetres larger).
5. Aerate the lawn; dethatch only if necessary. 6. Pull weeds as you see them or the chore may become unmanageable.
7. Begin succession planting gladiolus: corms pointy end up in full sun, 10 to 15 cm apart. Repeat weekly until mid-June.
8. Plant roses. Create a mound of soil at the bottom of planting hole and spread roots over it, then backfill.
9. Sow seeds for summer-blooming perennials and biennials directly into the garden.
10. Clean and store bird feeders for next winter. 11. Resist the temptation to buy cell-pack annuals already in bloom. Younger plants will be stronger.
12. Happy Mother’s Day! As long as nighttime temperatures aren’t below 13 C, it’s safe to plant annuals.
13. Handle pests naturally by applying pyrethrins, insecticidal soap or neem oil.
14. Encircle a soaker hose over roots of newly planted trees. Water deeply now and regularly during their first year.
15. Plant corn now and you’ll be enjoying it at your August cookouts.
16. Harvest third-year (or older) asparagus when stalks are 15 to 20 cm long. Leave younger ones in the ground.
17. Give beds and borders a crisp edge — you’ll be surprised at the difference it makes!
18. Inspect undersides of hollyhock leaves for the orange pustules of rust fungus. Remove and discard affected foliage.
19. Prune grey tips from junipers. 20. “Harden off” vegetable seedlings. Place outdoors in shade for incrementally longer periods each day for a week before planting in the garden.
21. Prune spring-blooming shrubs as soon as their flowers fade.
22. Plant herb seedlings outdoors and water (they never need fertilizer).
23. Shear an inch off dianthus and creeping phlox when they’re six inches tall; don’t worry — they’ll grow fuller.
24. If the lilacs are blooming, it’s time to plant dahlias.
25. Mulch beds and borders to suppress weeds, retain moisture and nourish soil. Never create “volcanoes” around trees or mulch deeper than three inches.
26. Plant tomatoes, peppers, melons and other summer crops into the garden; water and apply mulch.
27. It’s time to fertilize the lawn. Apply half a kilogram of slow-release nitrogen per 92 square metres (1,000 square feet).
28. Gradually move houseplants outdoors, but never African violets; they’re homebodies.
29. Fertilize faded bulb plants but don’t remove foliage until it has died.
30. Use colourful annuals, like zinnias, to fill garden gaps left behind by early spring bloomers.
31. Plant tomatoes, peppers, melons and other summer crops into the garden; water and apply mulch.