I'm getting very frequent clogs of my brand new sprinkler heads.

It's a green, leafy growth that reminds me of thin kelp or some kind of seaweed.

I think it's mainly affecting one zone, but I haven't nailed it down to exactly that yet.

If it's only one zone, maybe one of the pipes feeding it got cracked and infiltrated by some kind of landscape leftover. It only seems like that would only be a root in the pipe though; surprised it's that green without some exposure to daylight.

Anyone ever seen this before? I could have made a sushi roll out of the stuff in one sprinkler head.

Thanks for any help.