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Have you thought about the weight? What sort of sedum were you planning to use? I have a Camomile lawn on a wooden pallet about 6ocm x 70cm well bedded in you can have. I have been tending it for a few years now getting bigger and bigger it started at 30 x 30 but to be honest it does not fit anywhere in my garden. Will post same picks later
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If you Google a big supplier they should have max angles on their website. So there maybe options that are more suitable than others.
Imo you'll need some sort of chicken wire to hold it because there is a catch 22 in planting it. You'll need to leave it in situ to settle and grow into a tight mass, but lifting it up all the time will disrupt it.
If you take your time and do a neat job I think chicken wire will look fine. Then over time it'll get covered and you won't see it. Even if you don't need it in the end adding it when building will be easier than taking time out to retrofit later.
Also if you make it taller then the max angle when lifting will be lower. There is probably an optimum you could work out with maths, but I'd be tempted to make a model with lollypop sticks and double sided tape.
Does anyone have experience of sedum trays for green roofs? I’m making a bike and bin store in my front garden. The bike area has a fixed roof and will be seedum. The bin roof lifts up for access so I was originally planning on having timber cladding. But I was wondering how well ‘stuck’ the seedum is in the trays. If I was to limit the opening to less than vertical would the seedum stay put? I could maybe add some netting or something to stop it slipping? Considering it’s about 1m2 and it’ll only be open for a matter of seconds. Does this sound like a crap idea?