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Rust appears as yellow spots on the leaves and slowly moves up the flower stalk as it grows. Hollyhocks can get a number of foliar diseases with rust being the most prevalent. Hybrids will have different looking off spring. The baby plants will only be the same shape and flower color of the parents if they are open pollinated heirlooms. However, to keep the hollyhocks coming each year, let some flowers go to seed to germinate into replacement plants. If growing on poor fertility soils, also add an organic balanced fertilizer such as 5-5-5.ĭeadhead spent flowers to keep the flower stalk tidy and to reduce the incidence of disease on the flowers and leaves. Hollyhocks need only compost in spring for fertilizer.
#Hollyhock seedlings install
Install these stakes and ties once the flower stalk forms, but before it starts to flower. Support tall hollyhocks in windy locations with stakes placed around the clump of plants and twine or Velcro plant ties used to support the flower stalks. Hollyhocks also need good air circulation to prevent diseases.
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This splashing encourages diseases, such as hollyhock rust, to begin. Also, plant away from the drip line of a building so soil doesn’t splash up onto the bottom leaves. Plant hollyhocks in groups so they can support each other during wind storms and not blow over.
#Hollyhock seedlings full
If grown in full sun on fertile, well-drained soil, hollyhocks will thrive in most locations. Thin seeds once they germinate to this spacing, moving the thinned baby seedlings to new locations in the garden. Hollyhocks grow best in a well-drained soil that amended with compost. Keep the soil evenly moist for best germination and plant establishment. Often hollyhocks are grown against walls, buildings and fences to highlight the tall nature of the plant, provide some screening and to give the plants some support. Grow hollyhocks in full sun for the best flowering. Plant seeds of tall varieties towards the back of a perennial flower garden. Plant hollyhock seeds and potted plants in spring around the last frost date for your area. There are single and double flower shapes and although the plants can grow to 9 feet tall, there are dwarf versions that can grow well in containers. The flowers range in colors from white to deep red and purple. Hollyhocks grow best in USDA zone 4 to 8 climates. However, hollyhocks are also rampant self sowers so if you leave some baby hollyhocks in the garden each fall, you’ll have a some in flower each summer. The second year it sends up a flower stalk, then dies in fall. Biennials mean the first year the plant just grows vegetatively. The short lived perennials will last 2 to 3 years depending on the variety and climate, then will need to be replanted. Hollyhocks are short lived perennials or biennial plants. The tall, stately flower stalks yield hibiscus-shaped flowers along their stems that bloom from summer until fall. Hollyhocks are classic English cottage garden plants that are favorites of many flower border gardeners.