How to Grow Cupflower — Nierembergia
Nierembergia–commonly called Cupflower–bears open cup- or bell-shaped, sometimes tubular white or light blue flowers in summer. It can be spreading or upright in form with alternate leaves. Nierembergia is usually grown as an annual; it is a perennial in mild-winter regions. Plants grow best where summers are cool. Where summers are hot, Nierembergia will need…
