This is a great checklist from Candian Gardening by By Lorraine Flanigan
Spread finished compost on beds; add kitchen scraps
and yard trimmings to the bin to start a new batch
Divide mature perennials such as phlox, showy
stonecrop and bee balm.
Harden off seedlings and transplant them to the garden
once all danger of frost is over.
Stake tall perennials such as herbaceous peonies,
delphiniums and bellflowers.
Install a rain barrel to collect runoff from eavestroughs
and use this to water your plants.
Plant out tomato and pepper plants once soil
temperature reaches 17°C.
Tidy up spring-flowering perennials, such as aubretia,
creeping phlox, pinks and thyme, by shearing them back
once they’ve flowered.
As rhododendron and azalea flowers fade and
seed heads form, pinch them off. This
diverts energy from seed production
to overall plant vigour.
Prune spring-flowering shrubs,
such as forsythias and lilacs,
right after they bloom.
Fertilize daffodils, crocuses and
tulips after flowering.