I used one of those drips that fit onto 2 litre bottles (old lemonade/Coke etc). It works really well. costs about £1-2 I think for 8, might get them for a £1 in a pound shop.

thanks for that i will try it before i go away

If you're only going to be away for 1 week,and the weather is'nt too hot, I would just give them a really good soaking just before you set off, and I would think they would then last the week you're away, of course it would depend on wether they're in the ground or in pots as pots would dry out a lot quicker than the ground, Derek.

as they will be in pots and hanging baskets in a green house will it be to hot in there for them

Hi Davej, I think that would depend on what sort of weather we're having at the time, if it's cloudy & raining then they would probably be ok, but if we happen to be having a heatwave, {what's one of those?} then I think they would probably dry out too quickly in pots and baskets, especially in a greenhouse, in which case you would be better going with Kildermorie,s suggestion.
Best of luck, Derek.

hi derek.thanks for you help.dave