Cosmos, Sensation Mix
Large plants make a bold, beautiful statement in your flower garden.
Borders, Container, Cut Flowers
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Cosmos seed should be sown directly in the garden after frost.
- Direct sow seeds in average soil in full sun after danger of heavy frost.
- Select a location in full to part shade with good rich well-drained organic soil protected from wind.
- Prepare the bed by turning the soil under to a depth of 8 inches. Level with a rake to remove clumps of grass and stones.
- Most plants respond well to soils amended with organic matter. Compost is a wonderful form of organic matter with a good balance of nutrients and an ideal pH level, it can be added to your planting area at any time. If compost is not available, top dress the soil after planting with 1-2 inches of organic mulch, which will begin to breakdown into compost. After the growing season, a soil test will indicate what soil amendments are needed for the following season.
- Sow seeds 4 inches apart and ¼ inch deep
- Firm soil lightly, water and keep evenly moist.
- Seedlings will emerge in 7-10 days.
- Thin plants to stand 8-10 inches when seedlings are 1 inch high.
- Keep weeds under control during the growing season. Weeds compete with plants for water, space and nutrients, so control them by either cultivating often or use a mulch to prevent their seeds from germinating.
- Mulches also help retain soil moisture and maintain even soil temperatures. For annuals an organic mulch of shredded leaves lends a natural look to the bed and will improve the soil as it breaks down in time. Always keep mulches off a plant’s stems to prevent possible rot.
- Keep soil evenly moist but not wet.
- After plants are about 6 inches tall, a light fertilizer may be applied. Keep granular fertilizers away from the plant crown and foliage to avoid burn injury. Use low rates of a slow release fertilizer such as Flower-tone, as higher rates may encourage root rots.
- Tall cultivars may need staking to prevent their thick, hollow stems from breaking due to heavy rain or wind.
- Pinch off spent flowers to encourage continuous bloom. Pinching stem tips can reduce height and encourage branching but isn’t necessary. Deadheading is recommended since it lengthens the bloom season. Cosmos plants that aren’t deadheaded will self-sow in warm regions.
- Monitor for pests and diseases. Check with your local Cooperative Extension Service for pest controls recommended for your area.
- Remove plants after they are killed by heavy frost in fall to avoid disease issues the following year.
- Cosmos plants can withstand heat and drought conditions.
- Tall cosmos add a soft, airy touch to the back of an annual or mixed border. You can also use them as a fast-growing annual hedge or in a cutting garden. Since the taller cultivars are not always uniform in height, they’re perfect for adding an informal look to cottage gardens. Shorter cultivars of both species are ideal near the front of the border, in containers, or as edgings.
- Cosmos makes beautiful cut flowers.
- Because cosmos is easy to grow and the seeds are large and easy to handle, it is a good choice for a children’s garden.
SunFull SunHeight36-48 inchesSpread12-14 inchesOrnamental UseBorders, Container, Cut FlowersLife CycleAnnualSow MethodDirect SowFloweringtrueBloom Duration10
Cosmos, Sensation Mix is rated out of 5 by 10.Rated 5 out of 5 by Izmeister from Lovely Cosmos! Beautiful, carefree flowers! This was my first time growing cosmos and it won't be the last. I direct sowed them on March 30, and the blooms started appearing as soon as June 1. Keep in mind that each individual plant will produce flowers of the same shade of pink, so if you want a wider variety of color, plant several cosmos together to get an array of blooms.Date published: 2015-08-30Rated 5 out of 5 by Mayflowers from Beautiful Cosmos Cosmos are one of the easiest seeds to grow. They are delicate looking with their fern foliage, but do not be deceived as they are very hardy! They make great cut flowers that last. You must have these hassle free flowers in your garden.Date published: 2014-09-21Rated 4 out of 5 by Chris515Gardener from Colorful cosmos! Great type, but I planted it in more of a clay type soil, and could of watered it more during the summer. It only reached less than a foot tall, but the blooms were very colorful and after they dried up they seeded. I'll have to see in the Spring iff they come back up!Date published: 2014-02-15Rated 3 out of 5 by Igor from Cosmos, Sensation Mix The germination rate was about 50%, under the same conditions as that for the Zinnia Cut-and-Come Again and the Mammoth Russian Sunflower, both of whch were about 95%. Once out, the seedling are doing OK, I plan to transfer all three to flowerbeds in a week. I have been doing this for years, and must say the cosmos seeds played hard to get this time. I can send you photos of the flowers, they are always spectacular. The birds and squirrels love the sunflower seeds, and the neightbors always compliment us on the colorful combination of cosmos and zinnias. On anotther subject, why use what looks like 3-point fonts in this window? You have lots of wasted white space. Regards, IgorDate published: 2012-05-09Rated 4 out of 5 by Nevets from Easy, reliable but... I'll add myself to the list of those for whom this plant grew taller than the indicated height, but this disappointed me a little as it towered over the rest of my garden and looked out of place. They weren't as prolific for me as I would have hoped, but others seem to have had better luck and a disproportionate number of plants were the same mauve color. That said, they are great because they're so easy to grow with strong stems (even at 6-7 feet no staking required), make great cut flower and have very attractive, wispy foliage.Date published: 2011-02-15Rated 5 out of 5 by TLC26 from Dependable, beautiful, and bountiful! I've been planting these beauties for many years now--in two different homes. They are the MOST dependable seeds I've ever planted. They never fail. And they never fail to produce beautiful flowers. Mine frequently grow to more than 6 feet tall! When friends come to visit, they marvel at the strength and proliferation of the flowers. They comment on my green thumb, and I snicker to myself. Little do they know I just sprinkle these seeds in the garden randomly, toss a little soil over top (sometimes), and let them do their thing. They even re-seeded themselves one year when I forgot to order the seeds. I love these flowers in a wild, random area of my garden. The goldfinches love them, which is a bonus, since I love to see those little cuties outside my back window in the morning. Can't imagine it being summer with Cosmos. I HIGHLY recommend these flowers, particularly for novice gardeners. You'll look like a master gardener!Date published: 2011-01-08Rated 5 out of 5 by bandytbd from huge cosmo my wife purchased a pack of cosmo sensation seeds. I went ahead and planted them for her. I have never been a fan of planting annuals so I did it only for her. But let me say these plants are huge we have one approaching 8' tall. Really neat plant she is dying to see the blooms, we have 14 plants and only used half of the package.Date published: 2009-08-03Rated 5 out of 5 by GardenGirl88 from Reclassify as Annual Trees! I'm not sure if it was my garden or just optimum growing conditions, but these things went completely crazy in my '08 garden! I had cosmos that were about 6 feet tall and loaded with blooms. I had a fresh bouquet in the house every couple of days with no end until our hard frost. But, if I had known they would take over, I never would have planted them in my veggie garden. It was like walking through a jungle! I am planting them again this year, but in another garden as a divider between veggies that don't get along. They can grow to their heart's content there!!Date published: 2009-01-24