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Rose bloom balling

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Time to act
Time to act

Do not Time to act in January

Do not Time to act in February

Do not Time to act in March

Do not Time to act in April

Do not Time to act in May

Do Time to act in June

Do Time to act in July

Do Time to act in August

Do not Time to act in September

Do not Time to act in October

Do not Time to act in November

Do not Time to act in December

Balling is triggered by cool, damp conditions, often in a partially shady site, where water-saturated outer petals fail to dry out before being scorched by the sun. The mushy plant tissue dries to form a stiff straightjacket around the petals, preventing the flower from opening. An invisible soft, slimy layer of mycelium then fuses the petals together. The problem is most acute on roses with a multitude of thin petals.

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Symptoms

Apparently healthy rose buds develop and fatten but fail to open. They eventually wither or drop off.

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roses

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Organic

The only option is to cut off the damaged buds and wait for new ones to develop. Be careful not to trigger the problem by splashing water onto the buds when watering your roses. If damaged buds aren’t removed, there’s a risk that grey mould may develop and cause the stems to die back. If this happens, prune back shoots to healthy growth.