Drip Irrigation for Pots and Planters
Short Answer
Put the containers on their own drip zone, with a filter and a pressure regulator ahead of every emitter. Carry the water in blank 1/2" poly tubing out to the pots, and use 1/4" micro tubing only for the last short stretch into each container. A pot holds a small amount of soil and dries out on its own clock, so it needs a schedule the lawn and the beds are never going to give it.
If a separate zone is not practical, pots can be added to an existing spray zone through a Rain Bird 1800-RETRO dropped into the 1804 body, which filters and regulates the water right at the head while the rest of that zone keeps spraying. What does not work is the little adapter that screws in under a spray head: it has no pressure regulation, and the emitter it feeds is hidden down in the pot where you will not see it plug up.
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Two Ways to Put Pots and Planters on Drip Irrigation
Everything else on this page follows from this one choice. Either the containers get a valve of their own, or they ride along on a zone that was built for something else. Both can be done properly. Only one of them lets the pots have their own schedule.
How we prefer to build it
Their own drip zone
A valve of its own, feeding a drip valve kit that filters and regulates before the water reaches an emitter. The containers get a runtime set for containers, and the lawn and beds keep theirs. This is the same idea as hydrozoning the rest of the yard: things that drink alike share a zone.
Best for patios, rows of planters, raised containers, and anything you would be annoyed to lose.
The add-on
Off an existing spray zone
A Rain Bird 1800-RETRO takes the place of the internals in an existing 1804 spray body. It filters and regulates right there, and the outlet leaves the top of the body into blank poly. The other heads on that zone keep spraying. More on that swap in our guide to converting a spray head to drip.
Honest limitation: the pots run when that zone runs, for as long as that zone runs. It is the right answer for a few pots beside a bed that already has a zone, not for a patio full of containers.
Hanging baskets are their own case. They hang in moving air with very little mix in them, so they dry out faster than the pots on the ground below them and belong on a separate zone. It can be built. Running tubing up to each basket and keeping it out of sight takes longer than a row of pots on a patio, so it costs more, and we would rather say that up front than surprise you with it.
Why Pots and Planters Dry Out Faster Than Beds and Lawn
A plant in the ground can send roots down after water. A plant in a container cannot. It gets whatever is in the pot, and when that is gone it is gone, no matter how wet the bed three feet away is. That one difference is why containers need their own schedule rather than a share of someone else's.
| Lawn zone | Bed on drip | Pots and planters | |
|---|---|---|---|
| Soil the roots can reach | Open ground, feet deep | Open ground, feet deep | Only what the container holds |
| How often in a DFW July | A couple of times a week | Weekly, deep | About once a day, more in wind |
| What sets the runtime | Turf type and how fast the soil takes water | Shrub and perennial root depth | Container size, exposure and wind |
| On a shared zone | It owns the schedule | Usually workable | Either the pots dry out or the bed gets drowned |
Penn State Extension puts container vegetable gardens at water “at least once daily” in hot summer months, and Texas A&M AgriLife's container guide says one watering a day is usually adequate, with leafy, foliage-heavy plants needing twice. University of Wisconsin Extension goes further for hot, windy weather, where containers can need watering up to three times a day. Nothing on your lawn schedule looks like that.
How a Drip System for Pots and Planters Gets Built
The hardware is simple, which is exactly why it gets installed badly so often. The parts that decide whether it still works in three years are the ones nobody looks at.
- 1
Decide where the water comes from
Either a valve of its own feeding a drip valve kit, or an existing 1804 spray body converted with an 1800-RETRO. Make that call first, because it sets the schedule the containers are going to live on for as long as they sit there.
- 2
Filter and regulate before any emitter
Every micro line gets a filter and a pressure regulator ahead of it, with no exceptions. Rain Bird's own homeowner guidance for container drip calls for a screen filter and a regulator holding an optimum 25 psi; a drip valve kit does that job at the valve, and an 1800-RETRO does it at the head, filtering to 200 mesh and regulating to 30 psi.
- 3
Carry the water in blank 1/2" poly
Blank poly is drip tubing with no emitters in it. One distribution line can feed a whole row of containers, and the route it takes is a site decision: the goal on every job is the least visible path we can find. Rain Bird puts 1/4 inch tubing at its limit past roughly 30 feet of run or about ten containers; we run 1/2 inch as the distribution line regardless, because it costs almost nothing extra and removes the question.
- 4
Keep the 1/4" micro tubing short
Micro tubing covers only the last stretch from the distribution line into the pot. We hold those pieces to about three feet. No manufacturer publishes a maximum; that number is our own standard.
- 5
Size the emitter to the container
Rain Bird's starting point is one 0.5 or 1 GPH dripper for a container under 10 inches across, and for anything bigger either several drippers branched inside the pot or one adjustable staked bubbler. Long window boxes get 1/4 inch emitter tubing with outlets every 6 inches. One emitter in a wide planter wets a single spot and leaves the rest of the root ball dry, so wide containers get outlets spread across the surface.
- 6
Sleeve the tubing where it leaves the ground
Anywhere micro tubing comes straight up out of the soil, it goes inside a short piece of Schedule 80 PVC standing three or four inches above grade. A string trimmer hits the pipe instead of the tubing. This is a two-dollar part that decides whether the system survives the first season of yard maintenance.
The parts those steps are talking about
Why Drip Irrigation in Pots and Planters Clogs
Emitter openings are small enough that particles which would sail through a spray nozzle collect and seal them off. Because the emitter is down in the pot where nobody looks, the first symptom is usually a plant that is dying for no obvious reason. Three things cause nearly all of it.
A single-port adapter screwed in under a spray head
This is the one we find most. A small 1/2" male by 1/2" female adapter threads in between the riser and the spray head with one 1/4" barb on the side, and a piece of micro tubing runs from that barb over to a pot. Some of them ship with a tiny screen in the 1/8" port. That is not a filter sized for drip emitters, and none of these adapters regulate pressure at all, so whatever pressure the spray zone runs at arrives at the emitter along with everything the line is carrying.
Long runs of 1/4" micro tubing
When the water is carried across a bed or a patio in 1/4" line instead of in 1/2" poly, every extra foot is more small-bore tubing lying out where it can kink, get stepped on, or get pulled loose when someone moves a pot. Long runs of micro are where we see clogging, whether an installer or a homeowner put them in.
Bare tubing coming up out of the ground
Micro tubing poking straight out of a bed with nothing around it is a string trimmer target. One pass and the pot downstream is dry, and nobody notices until the plant shows it. A container in a DFW August does not give you long.
Already have drip in your containers that is not keeping up? Start with our drip line repair guide, or read how we handle beds, trees and foundations on drip irrigation.
Drip Irrigation for Pots and Planters: Common Questions
What homeowners ask us most about getting containers onto an automatic system.
How do I water my pots and planters while I am out of town?+
Can pots and planters share a zone with my sprinklers?+
How many drip emitters does one pot need?+
How long should a drip zone run for containers?+
Can hanging baskets be watered with drip irrigation?+
Why do the emitters in my pots keep clogging?+
Put Your Pots and Planters on Drip Irrigation
We build container drip across the DFW Metroplex, filtered and regulated, on a schedule that belongs to the pots. Brandon looks at where the containers sit, how the line can reach them without being seen, and quotes it flat rate before any work starts.
TCEQ Licensed Irrigator LI0023963 · EPA WaterSense Certified Irrigation Auditor · Certified Rachio Pro