Plants destined as rose companion have powdery mildew..safe to plant?

Nollie

Is it safe to plant them under the roses or will it spread? Should I quarantine them and treat them with something first? They are Achillea Ptarmiga Perry’s White, which were healthy two days ago.

This is the third plant I have had problems with from a particular online nursery, you live and learn.

Obelixx

I'd quarantine them till it's gone.  Not worth risking the roses and other plants.

Nollie

I’m sure thats the right thing to do @Obelixx, just needed someone to give me a slap and tell me so 

I will hose them off and leave them in the sun for a while to see if that helps, maybe scrape off and renew the mulch. The infection doesn’t look too serious, but anything else I can do, do let me know.

Cheers.

Obelixx

Mildew is often from being too dry or too damp so check they are well watered but allowed to drain so not sodden.   Give them time to recover.

Complain to the nursery.  If that gets you nowhere see if they have a Facebook page and shame them there.   Don't buy from them again till you get satisfaction.

Nollie

Thanks Obelixx, will do. I think, I hope, I caught these ones in time. The salvia from them are still poorly and 3 of 7 penstemons were dead or diseased. I’m pretty convinced it was the nursery, as they arrived in poor condition, too wet, covered in algae and badly packed.

Tricky proving it though as I didn't take photographic evidence of how they arrived, but I will complain in my appalling French! Whatever happens, I won’t be buying from them again. I will stick to my usual supplier - all theirs, grown in the same conditions, salvia and achillea included, were vigorous and healthy.