Heres the whole thing Bob, I appreciate your help.
//First attempt at making a 4 zone auto watering system
//potPins values are just for setup purposes, must be calibrated once placed in soil
//potPins are to adjust the high and low moisture ranges for each zone
//must be used with Arduino Mega
const int zone1 = A0;
const int zone2 = A1;
const int zone3 = A2;
const int zone4 = A3;
const int potLow = A4;
const int potHigh = A5;
const int valve1 = 2;
const int valve2 = 3;
const int valve3 = 4;
const int valve4 = 5;
void setup()
{
pinMode(valve1,OUTPUT);
pinMode(valve2,OUTPUT);
pinMode(valve3,OUTPUT);
pinMode(valve4,OUTPUT);
}
void loop()
{
if(analogRead(zone1) <= potLow){ //read the value from the soil moisture sensor
digitalWrite(valve1,HIGH);} //open the valve
if(analogRead(zone1) >= potHigh){ //when value from soil moisture sensor reaches the upper limit
digitalWrite(valve1,LOW); //close the valve
}
}