Hollyhocks are perennial and can last for several years, but are best grown as a biennial due to problems with rust. You can try to keep rust in check by removing and safely discarding infected leaves. In autumn, cut completely to ground level, discard all old flowers and move any fallen leaves completely away from around plant. If your. plant has rust, then avoid using any seed. Rust is worse in wet summer. Dont plant hollyhocks too close together - good air circulation will help control rust.
Fungicides can be used to control rust, but it needs to be sprayed regularly of at least twice a week.
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Hollyhocks are perennial and can last for several years, but are best grown as a biennial due to problems with rust. You can try to keep rust in check by removing and safely discarding infected leaves. In autumn, cut completely to ground level, discard all old flowers and move any fallen leaves completely away from around plant. If your. plant has rust, then avoid using any seed. Rust is worse in wet summer. Dont plant hollyhocks too close together - good air circulation will help control rust.
Fungicides can be used to control rust, but it needs to be sprayed regularly of at least twice a week.