![]() ![]() Regular fluorescent lights work just as well. Don’t bother to buy special plant-growing light. Petunia seed propagation only happens when they get the right amount of light. Sprinkle them gently on top of the soil, using only a small pinch of seeds. It’s easy to over-plant the trays, ending up with dozens of seedlings you don’t need. When starting petunia seed plants, remember that the seeds are very tiny. Additional Tips for Growing Petunias from Seed Keep the soil moist but well-drained, and return them under the lights until it’s time to plant them outside. Lift out individual plants with a wooden stick or butter knife, and transplant them into potting soil. Transplant the seedlings into individual pots once they develop two or three true leaves. Use water-soluble fertilizer once every two weeks, and water the plants when the soil dries out. Keep the lights about 6 inches (15 cm.) above the tops of the plants. Remove the plastic wrap once the seeds sprout and place the trays under lights in a cooler spot, around 65 degrees F. Cover the tray with plastic wrap to retain moisture and place it in a bright place out of direct sunlight that averages around 75 degrees F. Sprinkle the tiny seeds on top of the mix and gently moisten them with a spray bottle. Of course, you can also start them in eggshells for easier transplanting later. Start out with a dedicated seed-starting soil mix and new or sterilized planting trays. In the north, this is around the first week of March and will be even earlier in more southern states.Īlthough petunias are tough and resilient in the garden, they can be very delicate in the first weeks of life. In order to get these seedlings to planting size at the right time, you need to start them indoors at least ten weeks before planting time. It does them no good to plant early in the garden, as they’ll just sit and sulk or rot. The most important point to remember when learning how to start petunias from seeds is that these are summer, heat-loving plants. Garden centers only carry a few varieties already sprouted and growing, but you can find petunia flower seeds for different sized plants in almost every color of the rainbow. You’ll save money because of the sheer number of plants you need, plus you’ll have a much wider range of flowers to choose from. It’s simple to buy a couple of petunia seedlings to fill one planter, but for mass plantings and garden edging, growing petunias from seed is the way to go. Petunias are so reliable and have such a wide variety of uses that it’s no wonder it’s one of the most popular garden flowers today.
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