What about the frost tonight-can I plant them tomorrow
There are a lot of ifs and buts with this one!!
Technically I would say it is OK subject to how long the frost lasts i.e. the ground won't be frozen yet.
Having said that I I would hold off for a few days certainly in my area where frost is forecast all week this week.
To alleviate your immediate problem of looking after them until you can plant them out, dig a hole, or in your case because you have three varieties, three holes, of a size suited to plant each variety in separate clumps.
Choose a sheltered spot but not a frost pocket to do this i.e. it doesn't necessarily have to be in their final quarters.
Then if the weather improves say next week follow the instructions here;
http://tinyurl.com/yjxmgeBe careful when watering them in, don't overdo it.
If you don't get them in by say by lunch time wait till the following morning (assuming it is not frosty) before watering them in, this will give the surplus water time to drain off before the temperatures cool dow again.
Personally I think it is a liberty for plant merchants to send plants out at this time of year.
Fingers crossed all will be well.
