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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