Spots On Giant Bugloss Leaves

Question

I have three reasonably well established Giant Viper Bugloss – echium pinnana They have all developed black blemishes, with a white outer, on their leaves All three are in large tubs and potted with a generic soil, mixed with some sharp sand Can anyone advise on this?

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Answer 1

This appears bacterial! I would apply the fungicide of your choice, and be sure that the soil has a chance to dry out down to about halfway into the pot between waterings.

For now, do not cut the infected leaves. Since it does not have many, I would only cut them once they die, completely.

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/ornamental/flowers/vipers-bugloss/growing-vipers-bugloss.htm