Drip Irrigation & Micro-Irrigation: Garden Kits and Drippers

Drip irrigation and micro-irrigation: water without wasting

A drip irrigation system delivers water directly to the base of the plant, at a rate of 2 to 8 liters per hour depending on the dripper’s flow rate. Compared to hose or soaker-hose watering, the measured savings run around 30 to 50% less water consumed over a growing season, because the water doesn’t run off the soil surface or evaporate. For a 20 m² vegetable garden, a basic kit with 16 mm PE tubing, 20 adjustable drippers and a timer is more than enough, with a budget starting around 40 to 60 euros excluding the tap fitting.

Drip irrigation, micro-sprinklers or soaker hose: which system for which crop

Standard drippers suit widely spaced plants: tomatoes, zucchini, shrubs, roses, grapevines. Micro-sprinklers, on the other hand, spray water over a radius of 1 to 3 meters and are designed for dense flower beds or row seedlings, where a single water point isn’t enough to cover the root zone. Soaker hose diffuses water along its entire length at low pressure, a solution suited to hedges and continuous borders but less precise for dosing plant by plant.

Dripper flow rate and spacing by crop type

A 2 L/h dripper suits a pot or planter with frequent watering. For a row of tomatoes or zucchini, a 4 L/h flow rate spaced every 30 to 33 cm reproduces the constant moisture these thirsty crops need in summer. On shrubs and small fruit trees, two 8 L/h drippers placed on either side of the trunk, 20-30 cm from the base, prevent water pooling against the bark while irrigating the active root zone.

Installing a micro-irrigation network step by step

Household water pressure often exceeds 3 bar, while a standard dripper operates between 1 and 2.5 bar. A pressure reducer fitted at the head of the network, right after the tap, protects the fittings and stabilizes flow along the full length of the hose. A 120 to 150 mesh screen filter, placed immediately after, catches the particles that clog drippers over time, especially if the water comes from a rainwater harvesting tank rather than the mains supply.

• Main hose: 16 or 20 mm PE depending on network length, buried or laid on the surface under mulch
• Fittings and drippers: push-in or in-line, fixed flow rate (2, 4, 8 L/h) or adjustable from 0 to 40 L/h
• Timer: battery-powered mechanical for a simple cycle, multi-program electronic for several zones with separate schedules

Uncoil the hose in warm weather to make it more flexible before laying it out, otherwise it resists and cracks at the bends. A purge at the end of the line, opened for a few seconds after filling, clears out air and manufacturing residue that would otherwise end up clogging the first drippers on the line.

Scheduling drip irrigation by season

In summer, two short 15 to 20 minute cycles early in the morning and late in the day limit evaporation better than a single, longer watering session. A battery-powered timer typically lasts a full season (April to October) without a battery change, provided it’s shielded from direct rain under a small cover. For potted plants, which dry out faster than in-ground plants due to their smaller volume of growing medium, a daily cycle of 5 to 10 minutes per 2 L/h dripper is the baseline, to be adjusted according to sun exposure and container size.

Network maintenance to prevent clogging

Flushing the network by opening the line ends two to three times per season clears out limescale and deposits that reduce the flow of self-regulating drippers. The filter should be cleaned at the same frequency, especially with well or tank water, which carries more particles than mains water. Before winter, fully draining the network and storing the timer somewhere frost-free prevents cracks in plastic fittings exposed to sub-zero temperatures.