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You need the measuring tape, the picture of the pipe system and the text about the irrigation system from the bag to be able to solve this. You measure from the black and white circle to the middle of a well.
Measure the distance from the circle of the aloe vera to the center of the various wells, which well is at a distance between 3.78 meters and 3.85 meters? There is a number on the well, this is the first digit of the four-digit code.
200cm / 120 = 1.667. So look for the well where the mint is 2 meters away. This is the second digit.
Where in the greenhouse is the eucalyptus. From there, follow the tubing on the picture and see which well this ends up at. That’s the third number.
The eucalyptus gets water from well 2. A multiple of 2 is 4, 6 or 8. Which well from the coin is further than 2 meters but less than 3.78 meters long?
The code is 1426.