Rockett salad

I have been trying to grow rockett and mixed herb salad leaves, in a sunny spot. I am finding they are bolting to seed before the leaves are even large enough to pick. What am i doing wrong?

 

It's probably the hot weather that's causing them to bolt. Try plenty of water and some shade?

 

angelad,i grew mine in a coldframe 2 to a single plastic cup then planted out.sadly theyre covered in tiny holes now but whatevers munching on them are leaving the Little Gem alone

 

I'm with Hornbeam here - plenty of water are (touchwood) keeping mine going ok. They are quite bitter/peppery though, which I understand is from the hot weather.

Try growing sunflowers in front of them for some shade?