propagating cuttings via hydroponics over winter
Hi, I'm trying to propagate some perennials from cuttings just taken, using hydroponics and grow lights.
I'd like some advice of the feasibility of this experiment please!
Pictured below is my propagation unit with the cuttings; the lights are on 15 hours a day and the fertilizer in the water is apparently NPK 5-3-8 with micronutrients. The cuttings are sitting in about a centimeter of water, surrounded by porous sterile stone, soaked by capillary action.
My hope is that the roots take, I can pot the plants on, sun under the grow lights for a while, then store in the conservatory over the remainder of winter.
The plants in this picture are from front: nepeta, salvia, hydrangea.
Has anyone tried this method with success, or have any advice to offer?
Thanks!
Phil.

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As has been said, salvia and nepeta cuttings root in grttty compost in a coldframe or kitchen windowsill too then overwinter them and the hydrangeas in a coldframe.
I would worry about encouraging over-soft growth if the overwintered in too sheltered conditions.
Most plants root easily in gritty compost or glass of water on a window sill.
Dont go into thinking that has an advantage, unless you’re growing tropical/specialised plants.
Even if they grow on quicker, you still can’t plant them out until all frosts have past.
I have 60 hydrangeas here, all grown from cuttings.
I have watched a couple of YouTube vids, but they don't say when to take them.
I take them any time from late Spring to late summer, must admit I have never taken them this time of the year.
i just cut bits off about 8” tall, strip of lower leaves leave a few on the top but cut then diagonally. Push well down round the edge of a flower pot then put a stick in the middle and a food bag over to seal.
The new growth will come from the base, from the soil, removthe bag as soon as you see the shooting. Take several when you’re learning, you’re bound to get one or two.