May. A sunny light exposure and an ordinary garden soil are adequate. The plant dislikes heavy soils but will tolerate soils with a pH above 7. Siberian wallflower grows one foot high and can be treated as a biennial.
Propagation is by seed planted in mid-summer.
If planted too early they bloom in the fall, then give a poor showing the following year. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension. Reprinting cannot be used to endorse or advertise a commercial product or company.