If your roses look like this, take action now for healthy bushes next spring and summer. Of course, sensible gardeners might prefer to sit by the fire with a book, but there are always jobs to be done in a garden and the following winter spray will ensure that our roses enter spring free of diseases. READ MORE:* Plants with blazing colour that last all winter* 8 new must-have plants to buy this month* How and when to prune Hybrid Tea roses in New ZealandNEIL ROSS/NZ GARDENER Give roses a clean-up spray in winter when the plants are dormant. Most of us can recognise at least one of the following diseases:BILL BRETT Black spot on rose leaves. If you water your roses in the evenings, water the ground only – do not wet the plant at all.

Source: Stuff June 02, 2019 12:22 UTC