Oh No

The very high temperatures of the past few days (humid and in the 90s) have broken, but it's still muggy.

I did a terrible thing to the brand new groundcover pussywillows (Salix yezoalpina):

 

They were so lovely back on May 27 when first planted:

What did I do?  I sprayed with horticultural oil because when they were still in pots, ready to be planted, they were infested pretty severely with aphids.  I sprayed extensively.  It was not heavy dormant oil that should only be used on stems before leafing out --- it was superior oil which can be sprayed on foliage.

But.  When temperatures are very high --- and we did approach almost 100 degrees a couple days back --- the foliage will burn.  The two plants I sprayed are brown and crispy.  A third one, added later, is not affected.

All three plants got a little stressed from the heat and from being transplanted.  It has been so dry until the last days, and although I watered, they were stressed. They are on the east side and get good afternoon shade, but the sun hits pretty hard up until 1 pm.

Hort Oil: use with care.  I also burned the nasturtium leaves pretty badly.  Even with the lighter oil, leaves become damaged when high temperatures hit.

The nasturtiums are putting out new leaves and will be fine.  I am hoping the same for the two dwarf pussywillows I damaged so badly.