A perennial herb that grows on old walls build with the use of lime.
( modern walls contain the acid Portland cement).
But the wallflwers grows also easely on moist soil, has beautiful
flowers with a lovely fragrance.
Wallflower or Erysimum cheiri
There are many cultivars , they have unwinged
seeds, are very well known cultivar with orange
flowers is called: Erysimum cheiri 'Orange bedder'.