Depending on the variety, marigolds can be both annuals and perennials. Choose the right type based on your region. Marigolds can be grown indoors before the last frost or directly sown after the danger of frost has passed outdoors. For thriving marigolds, place them under full sun, water them daily, trim leggy stems, and remove fading flowers. Marigolds (Tagetes spp.) are a popular flower for garden beds, and come in a wide variety of cultivars with a range of sunny colors. Many vegetable growers also plant them near tomatoes for their pest-deterring properties. Though most often grown or purchased as annuals, it's a little-known fact that some less common marigold varieties are perennial. Below, we detail the various marigold types you should know before growing them in your garden. Are Marigolds Perennials or Annuals? The most commonly planted marigolds are annuals, but there are some cultivars that are perennial shrubs native to Mexico. The majority of marigolds sold by plant nurseries or seed purveyors are either French marigolds or African marigolds. Sometimes these varieties will reseed themselves in the garden, creating the illusion that they are perennial, but any plants that come up in spring are new plants, not old ones. There are also pot marigolds (Calendula) which are an annual flower commonly grown from seed. Want more gardening tips? Sign up for our free gardening newsletter for our best-growing tips, troubleshooting hacks, and more! Popular Types of Marigolds Many gardeners choose marigolds for their colors or size, but with so many varieties available, it can be helpful to know their origins and botanical characteristics. Annual Marigolds Annual marigolds come in a very wide array of cultivars with a wide range of colors, sizes, and textures. There are three fairly common varieties. French marigolds (Targetes patula) : These are compact marigolds, growing up to 12 inches tall, with frilly, curved edges to their petals. This variety comes in a range of colors and is more likely to produce deeper red-orange colors. African marigolds (Tagetes erecta) : These marigolds can grow up to two feet tall and produce rounded, powder-puff shaped flowers with many petals. The color range includes many pale yellow and creamy white cultivars, as well as lime green and a range of oranges. The popular 'Crackerjack' marigolds are African marigolds. Signet marigolds (Tagetes tenuifolia): This variety has petite single-petaled flowers, though different cultivars may vary in height, from eight inches to two feet tall. These flowers have a string fragrance and are considered the best vegetable garden companions for pest deterrence. Perennial Marigolds Though they're not commonly sold in colder zones, these heat-loving perennial marigolds are native shrubs that grow well in warmer climates. Mexican mint marigold (Tagetes lucida): Also known as Mexican tarragon, this plant has culinary and medicinal uses. The taste and scent are similar to French tarragon, but this plant is easier to grow in warmer climates. This is the smallest of the perennial marigolds, reaching 1-3 feet tall. Hardy in USDA Zones 7-10. Mountain marigold (Tagetes palmeri): This semi-evergreen shrub has woody stems, often grows at altitude, and is between 3-5 feet tall and up to 6 feet wide. It has aromatic foliage and small, golden yellow flowers that attract pollinators. Mexican marigold (Tagetes lemmonii): This herby shrub has delicate, lacy foliage and is covered with small, yellow daisy-like flowers. Hardy in USDA Zones 8-11. How to Plant Marigold Seeds Marigolds are very easy to grow from seed and can be started indoors before the last frost or direct sown after danger of frost has passed. Plant seeds in well-draining potting soil or in garden beds. If planting outdoors, choose a sunny location, and rake the soil first to loosen the surface. The seeds should be planted just on the surface of the soil and patted down lightly. Water Daily. Water lightly with a mist sprayer until seedlings appear. Keep the soil moist but not wet. Once seedlings are an inch tall, water daily. Transplant seedlings outdoors. If growing indoors, transplant seedlings outside once the danger of frost is past. Thin seedlings as needed. Seedlings can be transplanted or thinned once they are at least two inches tall. Tips for Caring for Marigolds Marigolds are easy to care for and will bloom all season long. Grow in full sun. Marigolds bloom best in full sun, so make sure to plant or relocate them in an ideal location. Water regularly. Though they like sun and heat, marigolds thrive best with daily watering. Deadhead spent flowers. Removing flowers as they fade prompts more buds to form. Trim back the stems as needed. If your marigolds start to get "leggy," trim the stems back lightly to shape the plants. Stake taller plants if needed. Some taller varieties of African marigold might need some staking for support. Remove plants before late autumn. This will help prevent them from going to seed, but if you do want to collect seeds, they will appear as the last blooms have dried up.