I noticed this bee wasn't very energetic so I kept an eye on it to see whether it would fly away. When it didn't, I thought that perhaps it was really tired and lacking in energy so I went and got some sugared water. I went amongst the plants and tried not to trample them, then carefully spooned some water next to it. I tried to get the water as close as possible without getting it onto the bee for risk of hurting it. It still didn't move for the few minutes I kept watch over it so I smoothed the water over as close as I could. At last, the bee managed to draw enough energy to make a little lunge into the water. I then left it alone and just been to take a look and it's flown away! :D