Just wondering if anyone here can tell me if it is safe to give guinea pigs cress that is grown from just water? My kids have got these cress growing kits out a McD's happy meal and they are starting to sprout nicely. I thought it would make a nice addition to the piggies food.

This site says it is fine to give them water cress.

http://www.petwebsite.com/guinea_pig..._pig_fruit.htm

Salad cress i believe is fine, just in moderation, like most things really

cress is fine though a couple of mine are fussy and won't touch, the rest eat it no problem.