An electronic control units with one or two ways controlled by electrovalves for programmed watering of lawns, gardens, flower boxes and similar spaces, comprises a front panel (4), a display (12), watering program selection push-buttons (6, 7) for selecting the watering duration and the watering repetition frequency and at least one start push-button (10) for starting the selected program. The control unit further comprises an electronic micro controller (13) which, in response to the operation of said selection push-buttons (6, 7), controls the visualization of the duration and frequency of the selected program and, in response to a single operation of the start push-button (10), controls the immediate start of the selected watering program, while in case of operation of the start push-button (10) for a variable number of times, programs the delayed start of the selected program. In the case of the two-way control unit, the front panel (4) comprises two start push-buttons (10A, 10B) used for associating a selected program with one or another of two electrovalves (14A, 14B) for controlling the two ways (5A, 5B) and for the immediate or delayed start of said selected program.
