We use spray stakes. They spread the feed across more of the pot surface, and they're easy to see working and easy to clean. Our pick is the plum single 160° spray stake, rated 3.2 GPH: it waters the root zone slowly, so we can feed more plants at a time. We switch to drippers when a big system can't supply the flow sprayers need.
Either outlet only works if it wets the whole root zone at the flow your system can actually deliver.
Spray stakes vs. drippers
| Spray stake | Dripper | |
|---|---|---|
| Wetting | Spread across the surface | Concentrated in one spot |
| Flow per outlet | Plum 3.2 GPH, grey 6.6 GPH (single 160°) | Varies; 0.5 and 1 GPH are common |
| Checking it | Easy to see working and to clean | Harder to inspect and clean |
| Weak point | Pattern changes if pressure drops or the stake moves | Narrow passages need clean lines |
| Where we use it | Our pots | Our big greenhouse |
Why we use spray stakes
The goal is even wetting, not just getting water out of one spot at the bottom of the pot. A spray stake covers more of the surface, and a slow one like the plum lets us run more plants on a zone at once while watering each pot gradually. Big pots may need more than one: we've used several spray stakes or open tubes per pot to wet the whole top.
Sprayers do need more total flow than drippers. That's why our big greenhouse runs drippers: they fit what the irrigation system can supply. If you go with drippers, more than one per plant gives you some backup if one stops.
Set them up from a catch test
- Run several outlets for the same time into cups, including the first and last on the line.
- Set runtime from that measured flow, not the catalog rating. Our unregulated setup put out more than the rated 3.2 GPH.
- Water a few pots and check that the medium wets across the surface and down through the root zone. A pot can give runoff while one side stays dry.
Match the outlet to the manifold. In setups we've worked through with growers, open spray stakes ran on a regulated manifold and button drippers on an unregulated one.
Stakes spitting when the pump starts? If a valve drains the mainline after each feed, the small tubes can drain too and spit until the air clears. Check whether it changes how much each pot gets.
Fix dry patches and weak outlets
One outlet delivers less: clean or replace it and repeat the timed test.
Output is even but one side of the pot stays dry: move the stake or add outlets across the root zone, then check coverage and drainage from that pot again.
Clogging: figure out what it is first. White crust is mineral scale; RunClean at 0.2–0.4 mL per gallon keeps it from forming, and 1 mL per gallon works on existing scale. Debris is a filter job. Slime or biofilm is a sanitation job. See What RunClean does.
Mineral scale. Before and after.
A closer look at mineral-scale removal on a spray-stake emitter.
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