Beaver Valley Probus Club

Master Gardener's Corner - May 2022

April 30, 2022 4:17 PM | Anonymous member (Administrator)


Things to do in your garden this month—taken from the Ontario Master Gardener Calendar by John Hethrington, Past President, Master Gardeners of Ontario.

Please contact John for more information!

May 2022:

There are lots of things to do in your garden in May, now that Spring is here!

  • If not done already, clean up winter debris in the garden as soon as the soil is dry enough to work. Dig in manure or compost around perennials and shrubs and weed well. An extra hour weeding now will save 3 days later in the summer!! Use a line to cut sharp straight edges for your beds. For curved edges, run hot water through a hose to soften it up and lay out a smooth curve. Watch you don’t chop the hose!
  • Take coloured pictures of your spring bulbs in each of your gardens so you will know where there are any gaps and where the bulbs are when you plant more bulbs in the fall. Save the pictures in a safe place.
  • Plan now to plant early blooming bulbs like snowdrops and crocus in the fall at places close to where you come in and out of the house. It’s nice to be greeted by early signs of spring.
  • Add 3” to 4’” of mulch to flowerbeds and shrubs to conserve moisture and discourage weeds. Shredded cedar bark is best, but expensive. Try 13/Forty Landscape Supply who have 3 types of mulch: Cedar, Pine, Black and Utility, the cheaper kind that I use.
  • Don’t walk on or roll lawns that are still wet and full of water. If you can see your footprint, stay off. It will compact the soil.
  • If your lawn is already compacted, rent an aerator which will dig out small plugs. Let the plugs dry and rake them back into the lawn as a top dressing. Add grass seed to bare patches.
  • When dry, rake lawns vigorously to remove dead grass and thatch.
  • Spread weed-free topsoil on thin patches in your lawn. Apply grass seed, roll and water. Keep seeded areas moist, but don’t flood.
  • If you find moss in your lawn, the soil is too acidic. Apply dolomite lime before a rain. You may need a second application.
  • If you have pots or planters that are very big or deep, put some empty plastic water bottles with lids in the bottom of the pot to take up space the roots will never get to. It makes the planter or pot lighter and easier to move.
  • Prepare containers and pots for planting. Fill with a mixture of compost and potting soil. Add peat moss or better still, coconut coir to retain moisture.
  • Place pots with culinary herbs close to the kitchen door for easy access.
  • Walk around your garden and look for perennials that should be divided, are in the wrong place, or you don’t like any more. Pot them up for spring plant sales at least 3 weeks before the sale. Add compost, not garden soil to the pots. To be really fancy, add a little bone meal to the pot before you put in the plant. Add plant labels with the name (Botanical and/or common), colour, sun exposure, height, bloom time, etc. Water well and keep in the shade. The St. George’s Anglican church annual giant Plant Sale is looking for perennials and offering Income Tax Receipts for donations. The sale is Saturday June 11 on the church grounds in Clarksburg. It starts at 8 am this year!
  • Harden-off seedlings for at least a week before planting outside. Google the last frost date for your area and allow at least 1 week more before planting tender transplants such as annuals and tomatoes; this year, probably into early June.
  • Plant beans now directly into the garden as they germinate quickly and will grow as long as the soil is warm. Maybe mid-May this year.
  • Install peony rings before the plants start to grow.
  • Monitor for the presence of slugs, cutworms, earwigs and tent caterpillars.
  • Control weeds in the lawn by hand pulling. Use nematodes to control grubs, which eat the grass roots, leading to brown patches in the lawn in summer.
  • Prune roses according to type.
  • Deadhead (cut the blooms off) tulips, daffodils and other spring bulbs but do not cut or pull out the leaves until they are brown and decayed. They are needed to nourish the bulbs for next year’s bloom.
  • If you have any fritillaries or Asian lilies (day lilies are beetle free), now is the time to watch for the red lily beetle (adult, larva and eggs). So far, removal by hand is the best and only way to reduce this problem.


John Hethrington, Past President, Master Gardeners of Ontario


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Beaver Valley PROBUS Club

Box 148, Clarksburg ON N0H1J0

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