here is a wiring key for the above images...
red - 5v
black - Ground
blue - Clock 595 shift register
yellow - Latch 595 shift register
green - Data 595 shift register
grey - Selector 0 Analog multiplexer
ochre (gold) - Selector 1 Analog multiplexer
orange - Selector 2 Analog multiplexer
cyan - I/O for Analog Multiplexer
pink - solenoid valves and water pump
purple - 5v for soil moisture sensor probes
brown - analog inputs for soil moisture sensor probes