Enough energy is captured through photosynthesis to support growth and begin replenishing the roots. This is the period of most rapid growth. During Phase 2, leaves contain sufficient protein and energy to meet the nutritional requirements of most livestock. Phase 3 involves continued plant growth and leaves become more and more shaded. The lower leaves die and decompose.
Leaves use more energy for respiration than they can produce for photosynthesis.
Plant material is stemmy and fibrous. Nutrient content, palatability, and digestibility of leaves is poor. Remember Phase 1 - High quality but low quantity. Remember Phase 2 - High quality and high quantity. Remember Phase 3 - Low quality but high quantity.