Planting zinnia seedlings occurs in one of the ways: sowing seeds at home; sowing seeds immediately in open ground. If you haven’t applied any and your plant is yellowing, try a single application to see if it perks up. This low growing species comes in hues from golden yellow to white or orange. Various diseases caused by viruses occasionally attack zinnias. Learn more here. Stressed plants become susceptible to diseases including leaf blights and spots. 2. Sow the seeds in rows or clumps, cover them with soil, and water. Q. Zinnia 'Zowie Yellow Flame' That's quite the name, no? The extreme temperatures radiating from the concrete would kill most plants … Zinnias are native to Mexico, where they grow with a color that falls between orange and yellow. I'm suspecting a bug. Creeping Zinnia Ground Cover: Growing Creeping Zinnia Plants. Spacing: Plant zinnia seeds a few inches apart in rows or clumps. Some of my leaves have something white on them. Have you started seedlings indoors that began healthy and green, but all of a sudden your seedling leaves turned yellow when you weren’t looking? All in a mostly sunny area. For local production of cuts, harvest when more than half the flowers are open. Why Are My Zinnias’ Petals Turning Up? This is... 2) Make sure they are getting enough sunlight Sowing zinnia for seedlings. Most often, rot results from poorly draining soil and improper watering. Of the zinnia plant types, Z. angustifolia is the best choice for problem areas such as along parking lots, sidewalks and roadways. They suck on the plant juices removing chlorophyll and injecting toxins which cause white dots on the foliage. Zinnias are one of the easiest annuals to grow, grow quickly, and bloom heavily. History of Zinnia. It's important to give plants enough space to grow without crowding, so thin seedlings to allow about 6 to 12 inches depending on height. Lupin turning yellow. Or infection caused by fungal diseases like fusarium rot, blight, fusarium wilt, or septoria leaf spot. Bacterial Leaf Spot: Spots reddish brown to dark brown, angular and with a prominent yellow halo form on leaves. SYMPTOMS: Silver or bronze colored streaks on leaves, which eventually turn brown, dry and crumbly. Overwatering, however, is a very common cause of sickly plants. I have grown zinnias from seed for the last couple of years with great and satisfying results. If anybody know what could be causing this please help. Introduced in 1798 from its native Mexico, this golden-yellow daisy flower looks very much like a small black-eyed susan with short petals and a big brown eye. In open ground, seeds can be sown when the soil warms up after winter, that is, in May. If the leaves turn brown and wilt, there is the possibility that you have been overwatering. Zinnias need at least 6 hours of full sunlight per day, but it could be a deficiency of one or more nutrients, such as nitrogen, iron, magnesium, etc. Germination time for zinnias is typically seven to 10 days. When seedlings emerge from the soil, they put forth two starter leaves called cotyledons. freddiebrown Posts: 5. Follow the directions on your seed packet, but most zinnia seeds get planted about ¼ inch deep. It could also be due to pests like aphids and mealybugs. Planting in the Garden: Select a location in full sun with good rich moist organic soil. What Is A Cotyledon: When Do Cotyledons Fall Off, Why Are My Seedlings Leggy? The cotyledons are designed to get the plant started in the very beginning of its life, and once it’s producing more leaves, these aren’t really needed anymore and will often yellow and eventually fall off. The diseases are difficult to spot in their early stages. 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