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

Offer

Save 15% at Crocus

Enjoy a 15 per cent saving at Crocus. Choose from plants, tools, gifts, stylish outdoor accessories and more. Enter our offer code at checkout to claim your discount.

Use code: GWMAY15

Order now

Offer

Join Alan in the Isle of Wight

Join Alan in the Isle of Wight

Join expert gardener and author, Alan Titchmarsh, this September as you tour the magnificent gardens of the Isle of Wight, including Osborne House, Ventnor Botanic Garden and lots more.

Order now

FREE P&P

Subscriber only content

Chrysanths and carnations

Enjoy your own home-grown supply of fresh cut flowers this summer with these beautiful chrysanthemum and carnation varieties. You'll get free p&p when you enter our offer code at checkout.

Unlock now