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Glossary - P
Parasite Pasteurization Pathogen Peat moss Percolation Perennial Perfect flower Perlite Pesticide Petal Petiole pH Pheromone trap Phosphorus Photoperiod Photosynthesis Phytochrome Pinch Pinching out Pistil Pistillate flower Plant hormone Plant juices Plant species Plant stock Plant variety Plumule Pollen Pollinate	Pollination Pollinator Pore spaces Potash Potassium Potassium chloride Potato aphid Potato blight Potato eye Potato scab Potting mix Potting soil Pound Pounds per acre Pounds per square foot Powdery mildew ppm Predator Preemergent herbicide Propagation Protective coverings Protein Pruning Pupa Pupa stage Pupae Pupate Pyrethrins Pyrethrum