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Penstemon

The shoots on my penstemon plants turned brown, wilted and died off, can you give a reason for this and how to prevent it happening again?

The plants have most probably been affected by a wilt disease.

These tend to be soil-borne infections, gaining entry through roots that perhaps have been damaged by hoeing.

There is no real effective control, apart from removing the plant/s and some of the surrounding soil.

You could try spraying the plants with a systemic fungicide early on in the year as the new growth commences, failing that you will have to resort to the method described above.

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