What are plants studied to determine blooming times known as?

Plants studied to determine blooming times are referred to as plant phenological indicators because they provide insights into the timing of various life cycle events, such as flowering and leafing. Phenology is the study of the timing of these biological events in relation to environmental changes, particularly climate. By observing these indicators, researchers and horticulturists can make predictions about seasonal changes, agricultural cycles, and ecological interactions.

In contrast, growth stages refer more specifically to the different phases of a plant's lifecycle, such as germination, flowering, and fruiting, without focusing on their timing. Seasonal markers and developmental cues may capture certain aspects of growth and development but do not specifically address the timing aspect that phenological indicators do. Thus, the term “plant phenological indicators” perfectly encapsulates the study of blooming times in relation to environmental conditions.