Succulents and drought-tolerant beds: their own zone, watered rarely.
Aloes, century plants, desert rose and other succulents need little water and rot when the soil stays wet. This guide helps you decide how to keep them dry enough: a zone of their own, one small emitter per plant, and a run time worked out week by week. They sit at the opposite end of the water scale from flower beds, which is exactly why the two must never share a valve.
Written for homeowners and estate and facility managers. Updated .
Key points
- Never put succulents on the same valve as a lawn, a flower bed or a kitchen garden: the thirsty plants' schedule would keep them wet.
- Give each plant its own small emitter, set a little away from the stem, and give a large plant two rather than a longer run.
- Water deeply but rarely, and let the soil dry out between waterings.
- Water new plants more often while they root in, then cut back; an established bed may need water only in long dry spells.
- Plant in well-drained soil, mounded where the ground stays wet, and use gravel or stone mulch kept back from the stems.
On this page
Why a dry bed needs its own valve
A zone is the area one valve waters, all for the same time. California's landscape rules define a hydrozone as part of a landscape with plants of similar water needs and similar rooting depth, and add that a hydrozone may be irrigated or not irrigated at all.
Succulents store water in their leaves, stems or roots. University of California Master Gardeners advise deep but infrequent watering, letting the soil dry out between waterings, and warn that the fleshy roots and stems rot easily when overwatered.
On a valve with thirsty plants, they get the thirsty plants' water every time the valve opens. California's rules ask each valve to water plants with similar water use, and do not allow one hydrozone to mix plants with high and low water needs. Low with moderate is allowed, if the zone's water is worked out from the mix of plants or at the higher need. Hunter's drip guide gives each hydrozone its own valve.
So a dry bed never shares a valve with a lawn, a flower bed, a kitchen garden or pots. The worked example below shows what sharing would do.
The thirsty end: flower bedsZoning a whole home garden
Sources: California Code of Regulations, Title 23, section 490.2 (2025), Model Water Efficient Landscape Ordinance: definitions of hydrozone and plant factor; California Code of Regulations, Title 23, section 493.2.2 (2025), Model Water Efficient Landscape Ordinance: irrigation design plan, subsections (c)(7)(A), (d)(7) and (d)(8); UC Master Gardeners of Orange County (2024), Succulents fact sheet C08/2024: water, and soil and potting; Hunter Industries (2015), Drip Irrigation Design and Installation Guide (LIT-496), page 10.
Plants for a dry bed
The plants below all appear in a survey of 25 gardens around Jos, in the Nigerian Journal of Botany, along with column cactus (Cereus), prickly pear (Opuntia) and devil's backbone (Euphorbia tithymaloides).
The class is the plant's rating in WUCOLS, the University of California list behind California's plant factors: low is a plant factor of 0.1 to 0.3, very low less than 0.1, and moderate 0.4 to 0.6. These classes come from California and are a guide only: watch your plants and adjust. The other notes come from NC State University's plant database.
| Plant | WUCOLS class | Sun | Notes |
|---|---|---|---|
| Aloe (Aloe vera and other aloes) | Low | Sun to part shade | Very well-drained soil; let it dry out completely between waterings; overwatering rots the roots |
| Century plant (Agave americana) | Very low | Full sun | Grows large, with spiny leaves; root rot in poorly drained or wet soil |
| Desert rose (Adenium obesum) | Low | Full sun | Let it dry between waterings; soil that stays wet causes rot |
| Crown of thorns (Euphorbia milii) | Low | Full sun | Dry to medium moisture, well-drained; dislikes wet soil |
| Snake plant (Dracaena trifasciata, once Sansevieria trifasciata) | Low; moderate in California's low desert | Part shade | Tolerates drought; well-drained soil; do not overwater, or the roots rot |
Sources: Namo, Igoh and Agyeno (2021), Floriculture and national economy: a case study of the Jos Plateau, north-central Nigeria, Nigerian Journal of Botany 34(2): Table 9; UC Davis (2025), WUCOLS V: Water Use Classification of Landscape Species, plant search; California Code of Regulations, Title 23, section 490.2 (2025), Model Water Efficient Landscape Ordinance: definitions of hydrozone and plant factor; NC State Extension, Gardener Plant Toolbox: Aloe vera; NC State Extension, Gardener Plant Toolbox: Agave americana; NC State Extension, Gardener Plant Toolbox: Adenium obesum; NC State Extension, Gardener Plant Toolbox: Euphorbia milii; NC State Extension, Gardener Plant Toolbox: Dracaena trifasciata.
One small emitter per plant
Hunter's catalogue matches the emitter to the planting: sparse planting suits single emitters. A dry bed is sparse, with gravel between the plants, so each plant gets its own emitter and the ground between stays dry.
Flow is how much water passes in a set time, in litres per hour (L/h) for an emitter; pressure is how hard the water pushes inside the pipe, in bar. Hunter's point-source emitters are pressure-compensating: each gives the same flow anywhere from 1.4 to 3.5 bar, so the last plant on the line gets as much as the first. Barbed ones push into a plain supply tube, the smallest giving 2, 4 or 8 L/h; the threaded HEB screws onto a ½ inch riser. They need water filtered to 100 microns (150 mesh).
Set each emitter at the edge of the root ball, a little away from the stem, never against it, and move it outward as the plant grows; Arizona's extension service gives the same advice for shrubs. Give a large plant two emitters rather than a longer run, so one run time suits the whole bed.
Ahead of the zone go its own valve and a filter regulator, which filters to 100 microns and lowers the pressure to 1.7 or 2.8 bar; Hunter sells the two together as a drip zone kit. Leave an end on the supply tube that you can open to flush it.
- The lawn's own valve: its sprays throw away from the dry bed
- The dry bed's own valve, run on a program of its own
- Succulents spaced well apart in a raised, well-drained bed
- Gravel mulch over the soil, kept back from the stems
- One emitter beside each plant, a little away from the stem; the big agave has two
- Each emitter wets a small patch, with dry soil between the patches
Hunter HEB emitterHunter filter regulatorHunter PGV zone valve
Sources: Hunter Industries (2026), Product Catalogue Vol. 41, EMEA metric edition, pages 166, 168, 169, 176, 188, 189 and 190; Hunter Industries (2015), Drip Irrigation Design and Installation Guide (LIT-496), page 11; University of Arizona Cooperative Extension (2017), Watering Trees and Shrubs (AZ1298): weather, plant maturity, soil type, mulch and drip.
Worked example: a dry bed in the dry season
Water need in a day, in millimetres, is ETo times the plant factor. ETo is the weather's drying power: the water a well-watered field of grass would lose in your weather, in mm a day. A dry-season month in the north and centre runs at about 6 mm a day; the south, and the rains, run lower.
How ETo is worked out, in the crop guideThe flower bed's run time
Sources: Onwuegbunam and others (2025), Actual crop coefficients and yield response factors of irrigated tomato in Afaka, Northwest Nigeria, Journal of Applied Life Sciences and Environment 58(1): study location and Tables 1a and 1b; FAO (1986), Irrigation Water Management Training Manual No. 3: Irrigation Water Needs, chapter 3, Tables 5, 6 and 14; California Code of Regulations, Title 23, section 490.2 (2025), Model Water Efficient Landscape Ordinance: definitions of hydrozone and plant factor; FAO (1989), Irrigation Water Management Training Manual No. 4: Irrigation Scheduling, Annex I, Table 8; Hunter Industries (2026), Product Catalogue Vol. 41, EMEA metric edition, page 190; University of Arizona Cooperative Extension (2017), Watering Trees and Shrubs (AZ1298): weather, plant maturity, soil type, mulch and drip; UC Master Gardener Program of Contra Costa County (2023), Problems with succulents, help desk reply by Stephanie Hargrave.
New plants, then less water
New plants need water more often while their roots grow out into the bed. Arizona's extension service says to water young plants more often than older ones, and once they are established, in one or two years, to allow a slight drought between waterings. California's rules count the first year as the establishment period, or the first two years where watering will stop afterwards.
Even while they establish, let the soil around succulents dry between waterings rather than keeping it moist. Then lengthen the gap through the first year. Arizona's advice is to water arid-adapted plants less often, if at all, and California counts a hydrozone with no watering as a hydrozone, so an established bed of very low plants such as century plant may need water only in a long dry spell.
The X-Core controller has three programs, each with its own watering days, so the dry bed can run once a week on one program while the flower bed runs every morning on another. In the rains, switch the dry bed's program off.
Planning for the dry season and the harmattanTopping up rain in the rainy seasonHunter X-Core controller
Sources: University of Arizona Cooperative Extension (2017), Watering Trees and Shrubs (AZ1298): weather, plant maturity, soil type, mulch and drip; California Code of Regulations, Title 23, section 490.2 (2025), Model Water Efficient Landscape Ordinance: definitions of hydrozone and plant factor; UC Master Gardeners of Orange County (2024), Succulents fact sheet C08/2024: water, and soil and potting; Hunter Industries (2026), Product Catalogue Vol. 41, EMEA metric edition, page 105; Hunter Industries, X-Core controller: features; Hunter Industries, X-Core support: setting days to water.
Soil, gravel and drainage
Drainage matters as much as the schedule. Master Gardeners in California note that succulents need soil with good drainage and air, and that mounding the soil or planting on a slope helps where the ground stays wet.
Use rock or gravel mulch rather than wood mulch around succulents, and keep any wood mulch pulled back from the stems. Arizona's extension service adds that a rock mulch over the root zone cuts how often you need to water.
Sand drains fast and suits these plants. Clay holds water tightly and takes it in slowly, so water it slowly and less often; the soils guide shows how each soil changes how often and how fast to water.
Watering sandy, loamy and clay soils
Sources: UC Master Gardeners of Orange County (2024), Succulents fact sheet C08/2024: water, and soil and potting; UC Master Gardener Program of Contra Costa County (2023), Problems with succulents, help desk reply by Stephanie Hargrave; University of Arizona Cooperative Extension (2017), Watering Trees and Shrubs (AZ1298): weather, plant maturity, soil type, mulch and drip.
Signs and checks
- Before you add water, check the soil: roots rotting in wet soil can make a plant shrivel and drop leaves as if it were dry.
- Too much water: yellowing leaves, soft and mushy leaves and stems, soil that stays damp.
- Too little water: leaves that shrivel, wrinkle, turn yellow or brown and drop.
- After a run, each plant should have one damp patch beside it, with dry gravel between. Move any emitter that wets a stem.
- Check that every emitter drips, and replace a broken or missing one at once.
- Make sure no lawn sprinkler throws water onto the bed.
- Clean the filter and flush the supply tube as the maintenance guide sets out.
Irrigation maintenance through the seasonSeven causes of drip irrigation failure
Sources: Iowa State University Extension and Outreach (2023), Yard and Garden: Common problems and issues of succulents; UC Master Gardeners of Orange County (2024), Succulents fact sheet C08/2024: water, and soil and potting.
When to ask for a site-specific design
What depends on your site: the water source and how much it gives, the pressure where the system connects, how the soil drains, the plants and their sizes, and how the dry bed's zone fits with the rest of the garden on the controller. To start a design, send us:
- State and town or local government area
- Crop, or the type of site
- Area, in hectares, acres or square metres
- Where the water comes from, and how much you think you have
- How you pump today, and what powers the pump
- When you want the system working
Trademarks belong to their owners. ASFA IRRIGATION NG LIMITED is an independent company; no partnership is implied.
Landscape irrigationGarden products in the storeRequest a quote
Planning a bed of succulents?
Send us a sketch or photos of the bed and the garden around it, and tell us where the water comes from. We design and supply landscape irrigation, and installation can be quoted.