It’s that time of year again! For those of us in Canada, Victoria Day weekend is the traditional signal to plant tender annuals outdoors. The rule of thumb is that the risk of frost has passed, so it’s safe to get those colorful plants into the ground. I actually took a chance and planted some bedding annuals over the last two weeks, but I’ll be finishing up the rest this weekend. The weather forecast is perfect—sunny and warm—and we just had two days of rain, so Mother Nature already prepped the soil.
I’ll also be working on my hanging planters and deck box planters. Bright colors really make the deck a welcoming place to sit and enjoy the outdoors. Annuals are great for filling in spots where perennials aren’t blooming yet, and they add instant pop.
What about you? Do you follow a specific date or old wives’ tale for planting? I’ve heard of people using moon phases or waiting for snow to melt off nearby mountains. For me, it’s all about the calendar and a bit of luck. Any favorite annuals you recommend for containers or garden beds?
Topic Summary: Victoria Day weekend marks safe planting time for tender annuals in Canada. The author planted some early, finishes this weekend with perfect weather. Also working on hanging planters. Asks: Do you follow a planting date or tradition? Favorite annuals
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title: Annual Planting After Last Frost
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flowchart TD
A[Check Last Frost Date] --> B[Prepare Soil: Till & Amend]
B --> C[Select Hardy Annuals]
C --> D[Harden Seedlings Outdoors]
D --> E[Plant in Garden]
E --> F[Water Thoroughly]
F --> G[Apply Mulch]
G --> H[Monitor for Pests]
I’m in the US, just a stone’s throw from Canada, and the old wives’ tale here is to wait until the snow melts off the nearby ski mountain. Well, there’s still snow up there, and despite some warm days, the forecast is calling for near-freezing temps this weekend. I learned my lesson the hard way: I transplanted some watermelon seedlings I started indoors, and all but one bit the dust. Now I’ve got more started inside, and I’ll wait until all chance of frost is gone before planting them out.
Interestingly, the cooler-weather annuals are doing fine. Go figure. I don’t do much with flowers since we’re blessed with high-altitude wildflowers like fireweed—a brilliant orange-red that hummingbirds love. I also put out a feeder, but I know the natural nectar is better for them. I mostly focus on veggies, but I wouldn’t mind planting some nasturtium or other flowers to attract more hummers.
Hanging baskets are so expensive these days—$20 for one plant at Walmart! I’ll have to learn to make my own. Your deck box planters sound great; I’m thinking of moving some indoor plants outside for the summer and maybe adding a waterfall feature for the amphibians. But too many projects, not enough time. Happy gardening!
That’s a great discussion about the annual planting timing, and it really highlights how much local microclimate matters. Moogie’s Victoria Day rule works for many, but as Misanthrope found out, snow on a mountain or a late cold snap can wreck tender transplants. What I’ve learned the hard way is that even after the last frost date, the soil temperature is the real gatekeeper. Cool-weather annuals like pansies, violas, and even snapdragons can handle air temperatures in the 40s, but warm-weather stuff like zinnias, marigolds, and especially watermelons need soil at least 60F (15C) at 4 inches deep. If you plant into cold, wet soil, roots rot or just stall, and that’s why Misanthrope’s watermelon seedlings croaked.
I’ve shifted to using a soil thermometer and also checking the 10-day forecast. If the week after planting looks iffy, I’ll hold off or use cloches or floating row covers for the first week. That’s saved me more than once.
On hanging baskets, I fully agree they’re wildly overpriced now. Making your own is easy and way cheaper. I’ve been using a mix of trailing petunias (wave types), calibrachoa (million bells), and sweet potato vine for foliage. They fill in fast and bloom all summer. For hummingbirds, nasturtiums are great, but also try salvia (especially ‘Black and Blue’), and fuchsia in hanging baskets – hummers go crazy for those.
Here’s a quick decision flow I use after the last frost date to avoid replanting headaches:
flowchart TD
A[Check last frost date for your zone] --> B{Soil temp > 60F?}
B -->|Yes| C[Start hardening off seedlings over 5-7 days]
B -->|No| D[Wait or warm soil with black plastic]
C --> E{10-day forecast: lows > 50F?}
E -->|Yes| F[Plant annuals and add mulch]
E -->|No| G[Use row cover or cloches until warm]
G --> H[Remove after warm spell arrives]
H --> F
The wildflower approach Misanthrope mentioned is smart too. I’ve started integrating more native annuals like cleome and cosmos that self-sow and don’t need coddling. Less work, more pollinators. And yes, the hummingbirds ignore the feeder when fireweed’s out. That’s a win.
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