The main or branch structure of a plant that supports leaves and flowers, transports water and nutrients from roots to foliage, and stores food reserves.
In plain terms
Stems are the plant's backbone. They support foliage and flowers, move water from roots upward (xylem), move food from leaves downward (phloem), and store energy reserves. Herbaceous stems are green and soft; woody stems are brown and hard. Damaged or diseased stems weaken the whole plant.
Why this matters
Understanding stems helps you recognize damage, disease, or problems affecting plant function. Stem health indicates overall plant health.
In practice
Examples
Green herbaceous stem: young, flexible, actively growing.
Woody stem: mature, strong, long-lived.
Diseased or damaged stem: weakened plant; disease progresses down stem.
Healthy stem: firm, no discoloration or lesions; good growth.
Practical applications
Inspect stems for damage, disease, or insects; early detection prevents problems.