Ruby Gem is a very old wallflower cultivar, growing to 45cm tall, with rich ruby-red scented flowers.
Wallflowers are perennial, though they are usually grown as biennials in the flower garden for spring and early summer bedding.
A very ornamental plant, it is liable to die out after flowering, probably because it exhausts itself by producing so many flowers.
Plants require a very well-drained dry soil if they are to survive a second winter.
They grow well on dry stone walls and also on old mortared walls where they usually self-sow.
A good butterfly and moth plant.
A good companion for apple trees.
Prefers a position in full sun in a circumneutral soil. Succeeds in ordinary garden soils, tolerating poor and limey soils. Plants are liable to die out if the soil is too rich.
Sow spring in an outdoor seedbed. Germination should take place within 3 weeks. Plant the seedlings into their permanent positions when they are large enough to handle. If seed is in short supply, it can be sown in spring in pots in a cold frame. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in early summer.