Orbit has some wifi ones, but you can only monitor, not control them through ST yet.
My use case is similar to yours, but with new grass seed. I’ve oped to use Obit’s older Zigbee timer valve from Iris. I got two on eBay for super cheap that were brand new. They are battery operated, but I don’t know yet how long they’ll last. So far I’m very happy with them. One is currently being used, while the other is a backup waiting for another patch of seed to be spread where in ground sprinklers can’t reach.
It joined as a Zigbee switch, and it actually works pretty well that way. I wrote my own DTH for it, but it was more of a hassle, plus it’s super duper basic in what it reports.
This timer is hard coded to run for only 10 minutes if you control it via ST, but if you manually use it you can adjust the time up or down. I was never able to figure out how to change that through any parameters through ST with my DTH…
The way I use it is with my Spruce controller smartapp. Each Spruce zone is a device in ST, so I’ve been able to turn on the Obit timer after certain zone switches turn off/on via Automations or another smartapp I’m in process of writing. If the Spruce controller schedule doesn’t run because of weather conditions or the rain sensor tripped, neither will the Orbit timer valve.
When I need to run the timer valve for longer than the default 10 minutes, I have a couple Automations that kick it on back to back, but with a 20 minute wait time to let the water soak in to the ground and not wash the seed away. The Spruce controller does the same thing, but within their app, and it can be configured like crazy.