How to Grow Zinnias. These plants are considered annuals, meaning that once they are done blooming, that is the last time that they are going to bloom for the year and you aren’t really going to see them unless you purchase them again. The plants, spaced 18in (46cm) apart, had merged into a hedge standing over 4ft (122cm) high and were massively flowery and luxuriant. Plants grow 2-3 feet tall. Because there are so many different variants of the zinnia plant, they are divided into families. Grow the seeds of these winning companion planting combinations: Benary's Giant Lime and Purpletop Vervain, Big Tetra Mix and Purple Knight, Cut and Come Again and red fountain grass, Persian Carpet and Blue Horizon, Profusion Orange and Victoria, Star White and Black-Eyed Susans, and Zowie! The Button Box series will have double and dahlia-shaped blooms, and these plants can be considered the runt of this bunch, growing to no more than 12 inches tall. When all is said and done, zinnias are considered to be extremely low-maintenance plants. Zinnias are appropriate for seasonal use in all zones. Well-drained soil is important because zinnia seedlings can be prone to rotting in cool, wet soils. Hi! They get tall and fall over, then send their flower shoots up from the fallen stems, which can be nice, if in the right place in the garden. As a rule of thumb, because zinnias are unable to handle cold temperatures very well, it is important that you only begin to plant them after the last frost of the year has passed. Secondly, do zinnias come back every year? 0 1 2. There are spreading and dwarf zinnias that only grow about 6 – 8 inches tall and the classic Zinnia elegans can reach 4 ft. tall. With that being said, the amount of time that someone can spend keeping the blooms of a zinnia alive is going to be somewhere between 60 days and about five months. reseed easily, creating a cut-and-come-again garden each summer. Want tall, back-of-the-border plants with huge blooms like a dahlia? Once the seedlings reach about three inches tall, thin them so that they're 6 to 18 inches apart to maximize air circulation, a key to keeping zinnias looking good all season. Flowers can be daisy-like, double, cactus-flowered or a formal looking dahlia like flower. Plant dwarf zinnia seeds, which can grow as short as 10-inches tall. Then sit back and watch your zinnia patch mature and flourish. When the young zinnia plant is 6-8 inches tall, cut the central stem just above 2-3 side shoots. Some 20 varieties can have single or double heads and most grow 18-36 inches tall. At minimum, you should aim for the zinnias to get at least six hours of sunlight each day. Few bedding flowers produce as many blooms as quickly and easily as zinnias do. There are dwarf varieties 6 to 12 inches tall and wide, and others grow up to 4 feet tall and 1 to 2 feet wide. Ranging from 8″ mounds to rangy 3-4 foot tall bushes, and with flowers in a rainbow of colors, there is something for everyone among the hundreds of cultivars and … When the seedlings are 3 inches tall, they are thinned such that they are 6 to 18 inches apart. Plants are easy to grow, resistant to rain and flower until the first frosts Zinnias can range from being 10 inches tall to 4 feet tall. This zinnia species (Zinnia haageana) is a compact grower. Zinnias are one of the easiest annuals to grow- as long as you don’t plant them in cold weather. The Zesty series will grow to about 24 inches in height and produce tall double flowers, meaning that it is going to be a little bit larger than the Lilliput series. If you wish to start growing zinnia plants from seeds indoors, plant the seeds in peat pots, poo pots (pots made from cow dung) or other biodegradable containers that can be planted directly into the garden later. 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