#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

enum PlantType{
ROSE,
FICUS,
FERN,
ADS,
SDF,
ZZZ,
JJJ,
PPP,
END_OF_LIST };

PlantType plantType = ROSE;
char* plantString[] = {"T Type", "B Type", "E Type", "J Type", "K Type", "N Type", "R Type", "S Type"};
const byte buttonPin[] = {7};

void setup() 
{
pinMode(7,INPUT_PULLUP);

lcd.init();
lcd.backlight();
lcd.setCursor(1, 0);
lcd.print("Select TC");
  for(byte i = 0; i < sizeof(buttonPin); i++)
  {
    pinMode(buttonPin[i], INPUT_PULLUP);
  }
}

void loop() 
{
  int buttonSelected = checkForPress();
  switch(buttonSelected)
  {
    case 1:
      plantType = PlantType(int(plantType)+1);
      if(plantType == END_OF_LIST) plantType = ROSE;  //<<< Edited here
      lcd.setCursor(0, 0);
      lcd.print(F("TC Setected:"));
      lcd.setCursor(0, 1);
      lcd.print(plantString[plantType]);
      break;
  }
  delay(30);  //crude de-bounce
}

int checkForPress()
{
  static byte lastState[1] = {HIGH};  
  for(int i = 0; i < 1; i++)
  {
    byte state = digitalRead(buttonPin[i]);
    if (state != lastState[i])
    {
      lastState[i] = state;
      if(state == LOW)
      {
        return i + 1; //edit
      }
    }
  }
  return 0;
}