Hi,I planted these 3 hosts plants from roots about 3 or 4 weeks ago

What you've done there Rob, is you've 'forgc...sorry...forced them on indoors and then the shock of putting them out in the cold has hit them hard. The best thing now would be to leave them I think. They will produce new leaves later....in a couple of months. Or you could put them back indoors but you need to harden them off gradually next time by putting them out during the day and then back indoors overnight untill ...sorry...unit....sorry...until they are toughened up. Sorry the site isn't working today and I can't edit any of my tpy ...typing errors!!

Agree. They look a bit cold bitten.
and I can edit no trouble.

Ah ok the cold night have of late have not been kind to them. I'll bring indoors over night then and put them out in each morning.

I understand that don't like too much sun but some will be beneficial?

I find that generally they colour up better with some sun, but not too much.