Irrigation in Nantucket, MA

Sandy soil drains fast, and on Nantucket that means lawns and gardens can go from healthy to stressed within days of the water shutting off, especially under the drying combination of summer sun and salt wind. A properly designed irrigation system is less a luxury than a necessity here, delivering consistent moisture that sandy ground cannot hold on its own. But delivering it well, without runoff, waste, or dry spots, takes zoning and heads matched to the site.

Ryan Conway designs and maintains irrigation with the island in mind: zones grouped by sun, soil, and plant type so lawns, beds, and hydrangeas each get what they need, and efficient heads and controllers that water deeply and less often to encourage deep roots. Frequent light watering on sand just wastes water and grows shallow roots, so scheduling is as important as hardware. Because island winters are hard on lines, proper winterization and spring startup keep the system from freezing and failing.

What's included

• System design with zones matched to lawn, beds, and plant type
• Efficient heads, drip lines, and smart controllers to reduce waste
• Deep, infrequent watering schedules that build deep roots in sandy soil
• New installation and expansion or repair of existing systems
• Seasonal startup, tuning, and leak or coverage troubleshooting
• Fall winterization and line blow-out to prevent freeze damage

How the work goes

1. Zone by what the planting needs. Lawn, established shrubs, and thirsty annuals want completely different amounts of water. Putting them on one zone guarantees something is wrong all season, so zoning is settled first.
2. Design head layout and pressure. Heads are placed for genuine head-to-head coverage and matched within each zone, because mixing output rates on one line produces dry arcs and soggy patches that no controller setting can fix.
3. Run drip where drip belongs. Beds are far better served by drip than spray. It puts water at the roots instead of on foliage and loses much less to wind, which is a real factor on an exposed island lot.
4. Program deep, infrequent cycles. Scheduling aims at fewer, longer cycles that wet the full root zone rather than daily sprinkles that keep roots shallow. Sandy soil often wants cycle-and-soak so water infiltrates instead of running off.
5. Commission, then open and close each year. The system is tested zone by zone and adjusted through the season, blown out before winter, and started up again in spring with a full check for winter damage.

What to think about before you start

The commonest fault on island systems is not a broken part. It is a schedule watering a little every day, which keeps roots at the surface, loses a great deal to wind and evaporation, and leaves a lawn that collapses the moment the system is off. Watering deeply and less often, early in the morning when wind and evaporation are lowest, produces a more drought-resilient lawn on less water.

It is worth designing for the fact that peak irrigation demand on Nantucket coincides exactly with peak population, and the water comes from the aquifer under the island. Rain sensors, sensible scheduling, drip in beds, and grouping planting by water need are what keep a property green without simply running the system harder. Marking the layout matters too, because aeration tines, fence posts, and planting spades all find unmarked lines eventually.

When it happens

Spring startup with a zone-by-zone check, adjustment through the summer as demand changes, and a winterizing blowout in fall before the first hard freeze.

DrainageHydrangeaSalt-Tolerant Plants