althea are tall still hunt flora with large flower that are bright in color . The works will blossom for two calendar month during the midsummer calendar month . The plants are promiscuous to grow ; however , they are susceptible to a fungus disease call in rust . Rust can be control when proper measuring rod are taken .
Identification
Hollyhock is an easy - to - care - for plant that prefers full Sunday and organic ground . It is considered a short - endure perennial or herbaceous biennial and will reseed itself under proper condition . Hollyhock germ can be collect at the end of the time of year and manually reseeded in spring . The plant grow up to 8 feet in height and grow well near fence , next to building and for back borders . althea will grow well in the growing zone 2 through 9 .
Disease
Few disease impact althea ; however , hollyhock rust is a problem . Rust is a common and serious disease that is found in most hollyhock gardens and is diffuse by the weed mallow , which is a disease reservoir . The rust disease is a fungus that fan out by rainwater droplet splash on leave-taking and through tune transfer . If not treated , the disease deepen through summer and will eventually kill the flora . rust fungus will winter and infect the crown of sprouting plants in spring .
Symptoms
The rust disease in hollyhock appears as rust fungus - colorize bumps on the bottom of the leaves and steams of the plant . The disease starts as small rust flecks and produce into raised bump or pustule that will spread to all part of the plant life viridity . An infected plant life will look wilted and ragged .
Control of Disease
There is no curative for a rust infection . At the first signs of rusting , remove infected leaves and demolish them . look out the plants through the growing time of year and bump off any signs of the disease before it spreads . Since the fungus will winter , fall cleanup of plant life debris is essential for controlling the spread . Cut back and ruin all industrial plant stems and collect all loose leaf from the plants . Also off all mallow mourning band from the country . Do not compost infected works . When new sprouts look in spring , transfer the first two leaves as an attack to remove any spore stay from the previous season .
Prevention
Apply a fungicide to new industrial plant outgrowth in springtime for prevention . The rust disease will attack plant that are imperfect or under stress , so always keep flora watered . Do not overwater , as this will advertize fungus growth . move out weeds and put up air circulation around the plants to advance leaf drying in the plants .
