Hollyhock rust

Time to act:

Jun, Jul, Aug, Mar, Apr, May, Dec, Jan, Feb, Sep, Oct, Nov

Rust fungus is the curse of hollyhocks. The undersides of the leaves are often peppered with bright yellow or orange-red rust spots with corresponding beige-yellow splodges on the upper surface. Eventually, it affects the whole plant, with leaves starting to fall away from the base. In severe cases the stem becomes infected too, and the whole plant may die.

Symptoms

Orange-brown spots on foliage and stems. Leaves may die and drop from plants, weakening the plant and resulting in death in extreme cases.

Find it on

hollyhocks, mallow

Advertisement

Organic

Remove infected leaves from plants as soon as the fungus is seen. In winter, when the hollyhock dies down, clear away any infected leaves as they will harbour the fungal infection. Weeds such as common mallow, which are related to hollyhocks, also harbour rust so pull them out if they appear in the garden.

Chemical

Every two weeks from early spring onwards spray plants with a systemic action fungicide.

Advertisement

Discover more ideas and inspiration

Related content

Iris leaf spot

How to prune apple trees in summer

Acer tar spot

Clematis wilt

Related offers

SAVE 20%

Save 20% on perennials

Save 20 per cent on all autumn-planting perennials at Sarah Raven. Choose from a vast range of plants, including geraniums, hellebores, wallflowers, delphiniums and much more.

Use code: GW17WAP

Order now

Offer

40 wallflowers for £14.99

These hardy wallflowers are supplied as bare root plants, which establish quickly to provide reliable colour every spring. With this offer, you can buy 40 for just £14.99.

Order now

SAVE 10%

Subscriber only content

Save on container plants

Subscribers save 10 per cent across the entire range of plants and more at Sarah Raven, including beautiful Heuchera 'Little Beauty Blondie' (pictured). Simply enter our discount code at checkout.

Unlock now