Drip irrigation for vegetable garden and flower beds: practical guide
How to install drip irrigation for vegetable gardens, flower beds and hedges: components, flow calculation, emitter placement and differences from overhead sprinkler systems.
When to use drip instead of pop-ups
Drip irrigation is mandatory — not just recommended — in three situations: mixed-height flower beds, hedges and trees, and vegetable gardens. Pop-ups do not work here: plants block the spray and wet foliage instead of soil, promoting fungal disease.
Drip delivers water directly to the root zone. Evaporation is near zero and water use is 30–50% lower than overhead spray for the same irrigated area.
Components of a drip system
The basic kit: 16 mm main tubing, self-compensating emitters at 2 or 4 l/h, T-fittings, end caps and a mandatory 120-mesh filter. The filter is critical: emitter orifices are 0.5–1 mm and clog with particles in tap water.
For vegetable gardens use inline drip tape (e.g. Netafim) with emitters pre-installed every 20–30 cm: lay it between rows, connect to the main line and mulch over it. No individual emitters to position.
Flow calculation and sizing
Each 2 l/h emitter consumes 2 litres per hour of runtime. With 40 emitters you use 80 l/h — well within any domestic supply.
For long lines use self-compensating emitters: they maintain constant flow between 1 and 3.5 bar regardless of position on the line, preventing over-watering at the start and under-watering at the end.
Installation step by step
Drip requires no trenching: lay tubing on the surface or cover with 3–5 cm of soil or mulch. For shrubs use 1 emitter at 4 l/h for plants up to 50 cm, 2 emitters for shrubs up to 1.5 m, 4 for large trees.
For hedges, inline drip tape along the row is the fastest solution: 1 m of tape with emitters every 30 cm.
Maintenance and cleaning
Clean the filter at the start and end of each season: remove the mesh screen, rinse under running water and reinstall. If emitters stop flowing, soak the head in a citric acid solution for 30 minutes to dissolve lime scale.
At season end, open end caps to drain lines. In frost-prone areas remove emitters or blow out residual water with compressed air: ice inside emitters splits them.