how are everyone's zinnias doing?
rob333 (zone 7b)
5 years ago
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Iris S (SC, Zone 7b)
5 years agoIris S (SC, Zone 7b)
5 years agoRelated Discussions
How and where do you use zinnia and cosmos in your garden?
Comments (2)I direct sow zinnias beginning the first of May. There are swathes of space in my beds reserved for zinnias. I sow a group of 6 or 7 seeds every 12 inches or so in these areas. Use the watering can each morning. Thin to one plant every 12 inches. Nothing could be easier. Not planting zinnias too close to lawns (where morning dew can sometimes cause mildew) and making sure the plantings have a modicum of good air circulation are key. Also, never overhead water zinnias past the seedling stage. I favor the giant zinnias. Why waste time with those small varieties? A good companion for zinnias is mexican marigold, a bush type marigold with small yellow flowers & potato-leaf foliage that goes about 3 feet tall. Looks very nice interweaved with zinnias that don't have yellow flowers. Cosmos are pretty much just as easy, but while I have seeds, I really have other priorities at the moment. I may sow some soon though. Once it heats up is when you sow both cosmos & zinnias....See MoreHow long do Zinnia seeds remain viable in the soil or mulch?
Comments (5)Hi Highlander, "So, if they aren't coming up this year, how long will they last in or on the soil or mulch? Will the seeds dropped last year come up next year or in future years?" A very small percentage of zinnia seeds survive as "volunteers" the next Spring, but I wouldn't expect any of those seeds to make it to a second year. "That brings up question 1: How to prevent powdery mildew on zinnias?" A non-toxic way is frequent sprays of a product called GreenCure. It is basically potassium bicarbonate with a proprietary wetting agent. You have to spray it fairly frequently because it is water soluble and rains or even heavy dews can wash it off into the soil, where it acts as a source of potassium nutrition. I suspect it also foliar feeds some potassium. It is safe to use. It is better than using sodium bicarbonate. I breed zinnias as a hobby (see the "It can be fun to breed your own zinnias" message thread), and three years ago I found a tubular petaled mutant that I wanted to preserve as long as possible, providing pollen for crossing with other zinnias and developing seeds of its own. To prolong the life of that zinnia plant right up to our killing freeze, I applied Bayer All-in-One Rose and Flower Care as a drench applied about every two weeks, and it prevented Powdery Mildew and other foliage diseases on that zinnia specimen right up until it was killed by a hard freeze in late Fall. It is fairly expensive, so I don't use it routinely on my zinnias. But since it is systemic, it isn't washed off by rain and it spreads its protection to new growth, unlike surface sprays. It is not for organic gardeners, because it does contain "chemicals". I foliar feed my zinnias with Miracle-Gro products, and I am experimenting with adding some Physan 20 as a wetting agent and, since it is a bactericide and fungicide, among other things (some hospitals use it in their mop water), it may tend to prevent Powdery Mildew. This isn't the "season" for PM yet, so I won't know until this Fall if it can play a role in preventing PM and other diseases on my zinnias. But so far, so good. ZM (not associated with any product or vendor mentioned or linked)...See Morehow do you keep the bugs off zinnias?
Comments (3)ah, in that case I'm guessing it's japanese beetles, especially if the holes are clustered and end up giving the leaves a 'lace-y' effect. :( If I only find the odd japanese beetle, I like to *flick* it really hard. lol! Spraying the beetles with a mixture of dish soap and water will sometimes work, but it needs to be heavier on the dishsoap -- maybe 1 tsp dishsoap mixed with 1 cup of water. Some people like to take a bucket of soapy water out in the morning, and flick the jap. beetles into that to let them drown. If you have a severe japanese beetle problem, the organic solution is to use milky spore powder on your lawn... it kills the grubs, so you're really killing of next year's beetles. Otherwise, some will resort to "beetle bags" (usually yellow plastic bags that contain a pesticide and something to attract the beetles into it). If it's not Jap. beetles causing the holes in the leaves, then my next guess would be flea beetles....See Morehow easily do zinnias cross?
Comments (1)well, i don't get true cadystripe from collected seed. i don't know if you are talking about hybrids....See MoreAlisande
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