Plant library · Annual Flowers
Calendula officinalis
Calendula is a compact annual flower that brings a long run of bloom from spring into fall. Its roughly 18-inch height and width make it substantial enough to read as a flowering layer in a mixed bed without obscuring taller plantings behind it. Use it where its seasonal color can occupy open ground early and remain useful through the main growing season.
Place calendula along the front or middle of sunny borders, at the edge of a vegetable bed, or in blocks beside a path where faded flowers can be reached easily. A repeated drift gives its low, rounded habit more visual weight than scattered single plants. Keep it in front of taller annuals, vegetables, or perennials so the planting remains legible as it fills out. Leave a clear route for routine deadheading rather than burying plants behind a dense foreground edge.
Set plants 12 inches apart, center to center, for a close, continuous planting. Each plant can widen to about 18 inches, so expect neighboring crowns to meet and overlap lightly as the bed matures. For a border beside a path, hold the planting line back about 9 inches from the edge to leave foliage and flowers out of the walking surface. In wider beds, arrange groups in staggered rows rather than a single rigid line.
Give calendula a full-sun position with ordinary, well-drained soil and moderate watering. Avoid a persistently wet site, especially in a tightly planted border, so foliage can dry and plants retain a tidy footprint. Light shade can work where summers are intense, but deep shade reduces flowering and can make growth stretch toward the light.[1][2]
This is a cool-season annual, so reserve space for it in early spring and plan for its flowering presence through fall. Remove spent flowers regularly to keep new blooms coming and the planting looking intentional. In prolonged summer heat, plants can lose momentum; cutting them back may make room for a fresh flush when cooler conditions return.[1][3]
Do not treat calendula as a permanent structural plant in the layout: its occupied space is seasonal and will need replanting or replacement after the annual cycle ends. Give each group enough access from a path, bed edge, or stepping space to remove fading flowers without compressing nearby plants. In humid or crowded conditions, avoid enclosing it between taller foliage that limits air movement.[1][2]
Editorial content updated 2026-07-20.