The most cold-tolerant varieties of native hibiscus include hardy hibiscus (Hibiscus moscheutos) and halberd-leaved rose mallow (Hibiscus laevis), which can survive up to zone 4. The flowers of ...

Rose of Sharon (H. syriacus) and hardy hibiscus (commonly H ... supplement with a grow light in the morning and evening to keep your hibiscus happy. Related: The 11 Best Grow Lights to Help ...