The shortest variety is the dwarf zinnia, which grows as tall as 10 inches. Zinnias grow to between 10 inches and 4 feet tall, depending on the zinnia variety. Fertilize the soil once a week to keep the flowers blooming throughout the season. To care for zinnias that are growing in your backyard, water the soil when the top inch feels dry to touch. Fertilize the plants weekly to encourage the zinnias to bloom all season Caring for Growing Zinnias.Zinnias spread to about 1.5 feet, so plant one zinnia in a 6-inch pot or up to five zinnias in a 14-inch pot Water the compost until it becomes damp, then plant the seeds.Wait to plant until two weeks after the last frost has passed Fill one or several containers with commercial potting mix.To plant seeds in pots, follow these steps: Zinnias can be sown directly into outdoor pots when ground soil isn’t available. Transplant the seedlings into outdoor pots or into your garden once the seedlings have formed two or three sets of leaves Planting Zinnias in Pots.Place the pots or trays on a warm windowsill that gets at least six hours of full sunlight, with a room temperature of between 68☏ and 75☏.Water the compost gently until it’s damp to touch, then press the seeds into the soil, leaving 3 inches between each seed.Fill a seed tray or small pots with seed compost.To start zinnias in your house under cover in order to transplant them later, follow these steps: Fertilize the soil weekly to encourage the zinnias to bloom all season Sowing Zinnia Seeds Undercover.Plant zinnia seeds ¼-inch deep in the soil, leaving at least 3 inches between each seed.Limestone can be used to raise soil pH, and peat moss or pine needles can lower pH Zinnias prefer a soil pH of between 5.5 and 7.5. Test, and if necessary, adjust your soil’s pH.Avoid shaded locations that block out the sunlight Choose a suitable location for planting the seeds.Wait to plant until spring, when the last frost has passed.To plant zinnias in the soil, follow these steps: Zinnias grow best when seeded directly into the ground instead of being transplanted because direct seeding avoids the risk of root damage. One zinnia plant needs, at minimum, a 6-inch pot. If you choose to plant seeds in a pot, make sure there’s enough room in the pot for the plants to grow. Zinnia seeds can be grown in a pot or planted directly into the soil.
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