Going to the store to buy food for your plants? You'll need to know in advance what those three numbers on fertilizer boxes mean. We live in a world of numbers -- phone numbers, license numbers, addresses and bar codes. Most we understand; some we don't, such as those aforementioned numbers on plant fertilizer boxes. They'll tell you everything you need to know -- but only if you can break their little code. First, remember: the code represents nitrogen, phosphorous and potassium in that order, and the number tells how much of each is in there. Second, remember: up, down, and all around. Nitrogen (No.1) goes up for a healthy green. Phosphorous (No. 2) goes down to the roots. And potassium (No. 3) promotes all-round good health. Just ask your friendly nursery person which combination is right for your plants, and relate your specific gardening goal. And that's the On The House tip for today.