Ian - the two roses I’m putting in today will be going into lawn in the area behind the wall. Thanks for all those options. I’ll read up on them today. Cheers, Chris.
If you have a garden and a library, you have everything you need. Cicero
With my wall I've been stockpiling balls of clay whenever I find some while digging. When I plant something into the wall I use the clay to plug the hole to stop the rain washing the soil out. It seems to be working well so far but you need to think about the path of water when it rains so that plants are getting watered. Sometimes the stones channel water away from certain spots so these can be too dry to plant in. You can also use the clay to bind john innes and grit so you can use it to sow seeds into the wall.
Normally with a stone wall for planting you'd build it with 2 skins of stone around a centre fill of gritty soil and have the outer stones sloping in slightly to make sure the water flows inwards. I think your trouble is going to be keeping enough soil in there for some plants so it might be best to stick to plants that are happy just to have roots among rock. Sedums, sempervivum and some saxifage seem the obvious choices. Have a think though about whether you want to see a lot of the stone or if you're happy for the plants to cover it up.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
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Ian - the two roses I’m putting in today will be going into lawn in the area behind the wall. Thanks for all those options. I’ll read up on them today. Cheers, Chris.