I've been itching to plant some lavender since late last summer, but was advised to wait until spring. I've just ordered some of the hidcote variety, but I've seen on the pages here that it's best to wait until May. Have I just wasted a load of money?
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I have Lavender cuttings in my greenhouse from last summer and there all sprouting new growth now. The lavender I took those cuttings from outside have no new growth yet. I suspect it will be 2-3 weeks before they start to put on new growth.
If you have a greenhouse, cold frame, cloche or a sunny porch stick them in there until May.
'The power of accurate observation .... is commonly called cynicism by those that have not got it.
George Bernard Shaw'
Weather forecast says temperature will drop by this time next week, and frost is to return. I don't have a greenhouse. Should I still plant them out, or keep in centrally heated house and keep watering until frost has past?
I don't like lavender so I don't grow it, but you may want to be more cautious with it for a short while.
Many plants are grown under cover so it can pay to be a bit careful for a few days. Certainly get them out through the day in a sheltered spot. I'd not be worried here about doing that, and then just planting them
I live in west central Scotland - not where that photo is...
The soil will be warm, but the air temperature might affect the top growth. Where you are in the UK and your local circumstances will have a bearing as well (exposed/sheltered site etc.). As you're in London where the ambient temperature is usually a few degrees higher, you should be OK.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.