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Wallflowers are basically a short lived spring flowering perennial so you sow from seed in May/June or buy in plants around September for flowering the following year-most people then ditch them to make way for summer bedding-you can keep them for subsequent years but they turn into woody straggly plants.
There is also another perenniel variety- Erisium -usually mauve or yellow
All are completely hardy
I have some purple wallfowers that I planted about 5 years ago and they have continued to flower ever since, summer and winter, snow and sun. One became too woody and straggly, as sotongeoff mentioned above, so has gone, but cuttings from it are flourishing, and one of the originals is still there.
I don't know what I am doing right, but they get plenty of sun and the soil in that area is not fed often.
Vanessa Mooney wrote (see)
I bought 30 small wallflower plants ...white and put in last weekend hoping for a good show in spring will small plants flower in spring on first yr
They should do-yes
I was late sowing wallflower seeds last year, mid August in trays. I planted them out in the mild November and they grew on really well and a few (5% maybe) flowered. Now we're in Mid June and the rest are refusing to throw up flower buds and are taking up summer bedding space - what do you reckon folks, pull or leave??
I have no flowers on mine either, huge plants but no flowers?
They won't flower yet.......winter and spring is their time.
Pinch out tips for bushier plants and transplant in autumn
Ed roe, let them grow but if you want the summer space then can you move them somewhere ?
Ideally sow in spring.
I have stocks......similarly biennial.......now in trays, then 9cm pots then in the ground until autumn. Planted to permanent positions then.
Wallflowers treated just the same
Sound advice Verdun, thanks, Ed
Thanks for that, I did actually plant them last November and expected them to flower in spring this year. Shall I leave them in and see what happens next spring or have they had their day?
Ruth, I would leave them in. Any buds I would pick off. Don't feed or water too much.....enjoy will prob enjoy a harder life to enable flowering next spring.
I'm wondering whether the mild winter confused them - probably didn't think it was time to flower yet.