I'm going to give up this year. No one I know has periwinkle, you can't buy it in the garden centers any more and it's too darn hot to put it in the ground without a lot of water, which is super-expensive in our village.
I'm also aggravated not just because I have to replace the plants, but because they were planted by my mom and aunt, who did a lot of work around the house after I got my kidney transplant in April. They both tried to give me a kidney and were denied so this was their way of pitching in. Now, it's gone and while I can replace the physical plants, I can't get back the ones that THEY put in the ground for me on the occasion of my transplant.
Plus, it's just a huge boundary trampling. I told DH that this is OUR house, not theirs and what would they say if I went to their houses and just started throwing out stuff that I thought they no longer needed? I think that's where things finally started to sink in with him, but then he went off the deep end and called his parents and told them that they were no longer welcome to do anything around our home. So now they will start going around and telling other relatives that they have been banned from our house and it's all my fault, which they did 10 years ago when a similar issue happened. We had just finally gotten to a decent place and now this happened. Ugh - I guess I'll have to take on the role of family shrew again for a while until this all dies down.
I'm livid on your behalf, as well.
But, at least where I am, periwinkle is pretty hardy. I wish I lived near you because I could give you slips off mine - I have both purple and white. If you can find it, either from a friend or by buying more, you should be able to put it in. If it isn't going in a shady spot, I'd wait to put it in until the temperatures cool off a bit but if you can get it in by the middle of September, it should get established enough to survive the winter.