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Avatar for Avarens
May 16, 2020 9:04 PM CST
Moline, IL
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!
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Avatar for oneeyeluke
May 18, 2020 3:01 AM CST
Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
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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.✌
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May 18, 2020 6:32 AM CST
Name: Sally
central Maryland (Zone 7b)
Let's all play ukulele
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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.
Plant it and they will come.
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