Ask a Question forum→Raised bed and flowering perennials questions

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Moline, IL
May 16, 2020 9:04 PM CST
I recently tried to put together a container garden of perennials on the south side of my home. The goal was to container a variety of decorative plants - to keep water away from foundation, reduce annual planting, and overwinter in our garage or 3 season porch. in the end, I am not pleased with it. I'm in Illinois, zone 5, a semi-urban area, with very little yard that is not heavily sloped. I am thinking of replacing the container with a raised bed. I have a 2 foot wide, 6-7 feet long area to convert. I am raising lavender, walkers low catmint, rosemary, April and may night salvia, dianthus, sun heuracha, and ornamental grasses. Pic is attached. Question: 1. How deep should I make the bed for these plants to yearly continue growth? I was thinking 24" or taller? 2. Will depth or material (wood versus metal) affect the overwintering? 3. can I use rock for drainage at the bottom of the bed, covered by a clay soil with dead grass lumps in it (that I dug from the perimeter of my yard and want to use to get rid of it lol, and for additional filler) followed by a good planting mix? 4. How to overwinter flowering perennials in a raised bed: do I cut back and cover with coir or design a hinged system or dome with heavy plastic/greenhouse plastic, or just cover with plywood? Thanks for any help!
Thumb of 2020-05-17/Avarens/8339b3
Thumb of 2020-05-17/Avarens/c052ce

Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
Hummingbirder Birds Organic Gardener Dog Lover Cat Lover
May 18, 2020 3:01 AM CST
Twelve inch raised bed will be ok and best, because 24 inches will cost too much to fill. Don't put any rocks on the bottom because that is not necessary. I would leave the clumps of grass out of the raised bed too. You can fill it with bag soil or have a sq yard delivered to your house from a compost and soil company. When you get your beds filled post another post on overwinter flowering perennials.
NOT A EXPERT! Just a grow worm! I never met a plant I didn’t love.✌
Name: Sally
central Maryland
Seriously addicted to kettle chips.
Charter ATP Member Houseplants Keeper of Poultry Vegetable Grower Region: Maryland Composter
Native Plants and Wildflowers Organic Gardener Region: United States of America Cat Lover Birds Butterflies
May 18, 2020 6:32 AM CST
I think the rosemary is the only one listed that is maybe not hardy there. Check the others, but most sound like ordinary fairly hardy ones. - especially as that is your south and sunny. My sunny south side bed at ground level is definitely a zone or two warmer.
i'm pretty OK today, how are you? ;^)

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