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I found this article written by Dr. John Howells on how deep to bury clematis. With so many people planting deeper these days, it could partially explain why so many people are seeing their clematis wilt.
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"Growing clematis is surrounded by myths, most of them wrong. Even planting has a myth. You should plant deep it says. That is wrong too.
The myth originates from the grower Rowland Jackman who, faced with wilt in his clematis, thought that if he planted deep this might cause extra shoots to come from the soil and these would act as a reserve should the main stem get wilt. No one has ever shown it works.
There are strong arguments against doing this. The most nutritious soil is near the surface and that gives your clematis the best start. If you want extra shoots then Jim Fisk showed years ago you can get them very simply by pruning the plant after putting it in the ground. Now that we know more about wilt we know that the affected node is often a bottom one; if you plant deep you will pull that node into the soil and increase the risk of wilt."
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