Perennial
Special terms
A plant that lives for more than two years.
Glossary of terms
A reference section with categories and short explanations.
Perianth
Special terms
The outer part of the flower. It can be double (divided into calyx and corolla) or simple (when the elements are not visually distinguishable).
Petals
Special terms
Modified apical leaves of higher plants that form the corolla of a flower.
Photosynthesis
Special terms
The process of forming carbohydrates in plant cells from carbon dioxide and water using light energy in the presence of chlorophyll.
Phylloclades
Special terms
A modified flattened shoot of a leaf-like form, located in the axil of a small membranous leaf (for example, in Asparagus).
Pinching
Special terms
Removal of the soft apical tips of shoots with the fingers. This promotes better branching of the plant and bushier growth.
Pistil
Special terms
The central part of the female bisexual flower, containing the ovules from which seeds develop. It consists of the ovary, style and stigma.
Pricking out
Special terms
Transplanting of vegetable, fruit, and ornamental crops at a young age, for example, from seedbeds into individual pots.
Prostrate plants
Special terms
Low-growing plants that form a carpet-like covering on the soil.
Pseudobulb
Special terms
Thickened above-ground stem of many epiphytic orchids, varying in shape from elongated spindle-shaped to bulbously swollen, often covered with longitudinal folds or grooves.
pH value
Special terms
Determines the concentration of hydrogen ions. A value of 7 indicates soil neutrality. Lower indicates acidity, higher indicates alkalinity. Most plants prefer a pH between 5.5 and 6.5. The pH can be easily determined with litmus paper (so…