Keep the soil moist but not waterlogged.Place the tray or pots in a warm, bright location, such as near a south-facing window or under grow lights.
Cover the tray or pots with plastic wrap or a humidity dome to create a warm and moist environment for the seeds.Sow your zinnia seeds about ¼ inch deep and water thoroughly.Fill a seed tray or individual pots with a quality seed starting mix.If you're starting your seeds indoors, begin the process about 6-8 weeks before your last frost date. Zinnia seeds can be sown directly into the garden or started indoors. Ultimate 35 Flower Seed Assortment for Planting: Create a Gorgeous, Vibrant, and Diverse Garden Introducing the Ultimate 35 Flower Seed Assortment for Planting – your one-stop solution for a stunning, colorful, and diverse garden that will leave your neighbors green… read more Germination I have some 8-inch and 10-inch square pots that I can use if I have to, but they take an awful lot of ProMix, so I try to make my 5-inch pots do.Wildflower, Perennial, & Annual Flower Seed Kit | 35 Variety Pack I plant my zinnia seeds in 3-inch pots, so they start out "re-potted" to that size, which gives them a few weeks before they need to be re-potted to 5-inch pots. If you have the 5-inch pots available and ready, go for it. "I had planned to move them to 36 deep cell trays today. Of course, you can overdo anything, and if the zinnia becomes excessively root-bound, then air-pruning of the roots can occur. Zinnia roots can almost form their own Jiffy Pots, with the added advantage that they don't have to penetrate a fiber pot to grow out into the surrounding medium or soil. I generally like to let my zinnias become slightly root-bound before I re-pot them or set them into the garden, simply because the zinnia roots can hold the root ball together and actually avoid disturbing the root system. Zinnias do indeed resent having that done to them, simply because zinnia root systems reach out extensively and the process of digging up a zinnia almost always causes serious pruning of its root system.īut the process of moving a zinnia from a pot into the garden, or from one pot to a bigger pot, does not need to cause any loss of the roots. In the usual garden context, "transplanting" means to dig up a plant that is growing at one place in your garden and move it to a different place in your garden. Garden books almost always say that zinnias resent transplanting, and some sources even go so far as to say that transplanting zinnias can cause double zinnias to become single. "Regarding potting up I was under the impression that zinnia did not transplant well if it became root bound at all." You might want to start thinking in terms of re-potting your zinnias to larger pots in order to keep them happy until you can set them out. So I plan to set them into the my garden before my safe no-frost date, with the idea of covering them to protect them from frost if that is about to happen. I would have to re-pot them again to 8-inch pots if I wanted to keep them safe inside until my no-frost date. The zinnia seedlings in this picture (taken yesterday) were planted in the middle of March, so they have only about 3 or 4 weeks of growth, and I have already re-potted them from 3-inch pots to 5-inch pots. They will have a flower bud by that time, which you may want to pinch out to encourage branching. Well, it looks like your zinnia seedlings will be 6 or 7 weeks old before you can safely set them out.
Oddly enough, that is pretty close to my safe no-frost date. "I am about zone 4b-5a, last frost date varies with who you talk too (I am in a micro climate) and ranges from about May 14 to May 22.
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