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Co-planting roses with marigolds
Swedboy
Posts: 394
I've read that planting marigolds next to newly planted roses can help them establish better as the marigold kills nematodes that attack the rose new roots. Anyone tried or heard about this?
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S.Yorkshire/Derbyshire border
I think there's some evidence that mycorrhizal fungi can help to establish newly planted roses and shrubs, but the jury is still out on that one.
I used it when I planted a rose where I dug another rose out and whilst it hasn't grown as vigorously as the other 2 identical roses it's doing well enough.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
I'm not aware of any benefit in the way you describe though.. if the soil is a friable loam, and has not grown roses, apples or pyracanthas recently, then you shouldn't need any amendments, or Marigolds..
They are not growing very fast or well. Partly because we are at the summer house for a couple of weeks each year. At least they survived year one.
The idea comes from some Swedish gardening sites and it seemed an easy thing to try
Your new roses are very likely suffering from Rose Replant Disease. There are simple methods to prevent it, by digging out the soil and replacing it with soil from another part of the garden that hasn’t had roses/rose family shrubs in there before. Dusting the roots of the new roses with mycorrhizal fungi when planting is also said to help counteract it. I tend to do both things, belt and braces.
I’m not sure anything you add to the soil or marigolds planted around retrospectively will help - you would’ve needed to do that to clean the soil in advance as Marlorena explained.