Bit of heat and Sun making plants wilt!

Hi all,
Well it looks like the nicer weather is finally here! However I got home to find a few of my plants had wilted a bit. The soil is moist and I also tested this with one of them things you push into the ground and it tells you how moist it is. It too said the soil is most.
So will I need to water the plants or should I resist the temptation? The plants that wilted are Lupins, Sedum Autumn Joy and Shasta Dasies.
Thanks
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Well the plants are getting quite big now to be honest. But when I planted them which would have been at the beginning of March, I did water them well and the soil feels moist around the base. But they still wilted? I thought sedum were very drought resistant so for them to wilt a bit too surely isn't right?
I will do
Shall I do that with the lupins and shasta daisies too?
I find all that lush growth wilts when the sun gets hot for the first time, but it soon gets used to it
In the sticks near Peterborough
To be honest, with perrenials, I water them well every week once the weather warms up. A good watering routine will promote stronger roots to your plants. I rarely loose a plant due to lack of water