By Tilly3006
Lancashire,
United Kingdom 
I purchased some penstemon plug plants a few weeks ago which are growing very well, but i have noticed that some of them are now showing signs of mildew. they are currently in a cold frame and i dont want to plant them into the ground until the spring. There are quite a few other young plants in the cold frame so i wondered if this was perhaps contributing to the problem through a lack of space and air circulation. any suggestions of what i could do, and will the plants survive? i have never dealt with mildew before so am a little unsure of what to do for the best. thanks
17 Sep, 2011
Answers
I thought you had Grown Penstemons...
17 Sep, 2011
great advice, thanks Bamboo
30 Sep, 2011
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You need a fungicidal spray which treats for mildew - it's a common problem at this time of year. You could try using 1 part full fat milk to 9 parts water and spraying with that, it's said to work, but I've only tried it on powdery mildew in high summer, when it did work, but I'd use proper fungicide at this time of year, especially in a cold frame.
17 Sep, 2011