Cheiranthus cheiri. Start Lollipop wallflower seeds early and the wallflowers should bloom the first year, which is unusual for a biennial. Exceptionally bright mixed colours in this mixture offer a nice contrast in early spring and summer. Plants are dwarf and compact, so very well suited to container growing. Use Lollipop wallflower seeds to create a long lasting border display. Learn when to plant wallflower seeds in our How to Grow Wallflower instructions in the tab below. Most wallflowers will be in bloom in early spring, coinciding with tulips. So they make the perfect container partner for tulip bulbs.