![]() You’ll want to get the timing right when using this method so you don’t end up with plants that are too big to manage indoors when the weather is still frigid outside. If the early sowing method I just described sounds a little too risky for your taste but you still want to get a head start on summer, you can sow these seeds indoors and then transplant them out after your last spring frost. Those of us in colder zones where the ground stays frozen throughout winter might also try pre-seeding our gardens with cosmos seeds in the fall or sowing them in the winter so they come up the following spring.īoth of these methods will expose young seedlings to early spring frosts, so keep your row covers at the ready in case any hard frosts are forecasted. When the seedlings are a couple of inches tall, thin them so you have only one every nine to 12 inches. You’ll learn more about how often to water established plants later in this article. Taper off the frequency of your watering as the seedlings that sprout become established. ![]() While the seeds are germinating, keep the soil moist, watering daily if needed. Taking a cue from what was happening among my volunteers, lately I have started sowing these seeds in early spring along with my cool-weather crops, just to see what would happen.Īs I suspected – and much to my delight! – my early-spring-sown seedlings survive light frosts, providing me with early summer blooms, a valuable asset in my region where the growing season is short. The number of volunteer cosmos seedlings that sprout before the last spring frost every year and survive to brandish their glory throughout the summer are proof that waiting may not be necessary. However, I’m not one to follow horticultural advice to the letter while ignoring what’s transpiring in my own garden, or the veggie plots and flower beds of many other gardeners. Every other source you consult will most likely recommend waiting to sow cosmos seeds until after the last average spring frost for your location. I look at cosmos volunteers not as “weeds” but as welcome “bonus” blooms.)ĭoes it sound like I’m digressing? I’m trying to make a point about growing these flowers from seed, and you’ll see where I’m going in just a moment, so bear with me…īefore you start sowing, you’ll want to know the best time to plant these seeds.Īnd now we’re coming to the point. (However, I must point out that a plant’s status as a “weed” is entirely up to one’s point of view. In fact, these seeds germinate so easily that they tend to self-sow, growing back from seed year after year, and they are known for becoming a bit weedy. Garden and sulfur cosmos are extremely easy to grow from seed, so if you are a beginning gardener (or just revisiting some of the basics) these are excellent flowers to start with. For chocolate cosmos, the most reliable propagation method is to divide tubers. You can propagate garden and sulfur cosmos by sowing them directly into the soil, or by starting them indoors and transplanting out the seedlings. ![]() In most parts of the United States, Mexican asters are considered annuals, though gardeners in USDA Hardiness Zones 9 and 10 can treat them as perennials. Although they are most commonly referred to by their genus name, these flowers are also known by the common name “Mexican asters.”
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