Genus Information
Sun Requirements
Alcea rosea Nigra can handle either an exposed or a sheltered position and requires full sun to thrive, this consists of more than six hours of direct sunshine per day.Hardiness
Black Hollyhock is fully hardy.
Growth Information
Alcea rosea Nigra is quite a fast grower and in the right conditions will reach its full size in 2-5 years. It can reach heights of up to 2m and will spread up to 1m.
Flowering
Alcea rosea Nigra produces purple and black flowers. These flowers will be produced between June to September.
Foliage
Black Hollyhock is a deciduous plant and produces green foliage and will benefit from being cut back once it has finished flowering to promote growth next year.
Wildlife, Pests and Diseases
Alcea rosea Nigra can have problems with Slugs and Caterpillars, it can also be vulnerable to certain diseases such as Rust. Also known to attract bees and other pollinators but is not considered to be toxic .
Soil Requirements
Black Hollyhock likes a soil won’t hold on to much water, doesn’t like sitting in the wet and it can be planted in soil of any pH.