Howdy,

A tomato needs full sun, water either every day or every other day, must have good drainage, and fertilized once a month. Usually the lack of drainage from a pot with clogged holes or clay soil where water will not run off will cause wilt.

If you have done all the things mentioned your tomato plant will do great.

Howdy, almatine,

If I'm correct you want to know why your trimmer auto feeds perhaps when it  shouldn't? Usually this is due to spring not fully seated in the trimmer. Simply open the trimmer and put the spring back in correctly so the tension is even again. Here is a link on how open your trimmer in case it's a problem.

http://community.homedepot.com/t5/What-s-New-in-our-Aisles/Replacement-String-Trimmer-Head/m-p/22003#M42