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Any idea what is causing this?
Kay8
Posts: 216
This first picture is a leaf on one of my dahlias. It looks dreadful, as I have quite a few and they all have this on. Any idea what could be causing this??
The second picture is of a primula leaf. I don't know if it's the same thing that's affecting it. Looks quite similar?
Thanks, everyone 
0
Posts
Primulas, in particular, need moist soil. Have the plants been very dry? Watering is best done at the roots of the plants too, to avoid splashing leaves if it's sunny. That can cause a bit of surface damage to foliage.
I'd just remove the dead and damaged leaves, and have a look at the soil. Poke a finger in and see if it's moist enough. I see the primula is in a pot, so it can be harder to keep them moist.
If you have a lot of mature plants in one area, they could be struggling to get enough moisture. Dahlias have a lot of foliage, and if they're a bit crowded together, they're can also be a lack of air flow round the plants which encourages mildew and moulds etc.
I live in west central Scotland - not where that photo is...