Most caterpillars in that posture are about to spin their web to make caccoons. Without picture no way to identify. Now that you have found the culperates no need for insecticide. Just keep watch for more worms and remove them when found.

A form of Bt will usually kill caterpillers and other leaf eating worms. Also slugs like tender greens if the area is damp. They come out at night when its cooler and damp. I had problems with chewed holes in the frut trees leeves. I sprayed BT a few days ago and its slowed down the chewing. will do it again soon as we had lots of heavy rain. They tend to drop down from trees above them and dangle until the wind moves them to a nice green spot below.

Though it would be helpful to see an image of your caterpillars, they sound like they might belong to the geometrid family, also called spanworms and inchworms (sometimes).

Please note that Bt-k (Bacillus thuringiensis-kurstaki) is only effective if the caterpillars are very young. From the size of yours, I'd not even try with it. Bt-k works only on caterpillers and no other kind of leaf-eating insect.

Keep up with the hand removal. It's your best bet.

Well I didn't see anymore of those pesky boogers, but I decided to spray it with some organic spray from Home Depot made for Fruit and Vegetable plants. We'll see how it goes tomorrow.

I also noticed that black ants (Sugar ants?) are crawling all over my mint, so I sprayed it too :P Gosh, did they disappear in a hurry like :P

I've just really gotten back into gardening, so I guess I'm learning all about these pesky little insects. A friend of mine told me to sprinkle red pepper around the plants and that it would keep the ants away. :)

I want to get a stevia plant, so I guess I'd better do that :P

On the bright side, will tending my growing garden, I had the opportunity to watch a Great Horned Owl mosey about my backyard with a little bird pestering him nearby :P And a little hare, who didn't see me, made his way onto my deck. Only when I moved and made a noise did he hop away. :)

Did it look like this guy? I just found it along with some cacoons under a leaf and wondering what to do. I don't know if they are moth or butterfly...

"Stop killing caterpillars! They're going to become beautiful butterflies! "

As much as we might like to think so, this is not true :-) Caterpillars will turn into butterflies OR moths but moths outweigh the butterflies by a factor of nearly 10!! So the vast majority of those caterpillars will eventually turn into moths. And regardless of what they may turn into, the caterpillars can be extremely harmful.....moth caterpillars much more so than most butterflies.

Did it look like this? I've been trying to figure out what this guy is on my Lemon Balm.

@HU-380165390 That is a yellow striped armyworm.