Whenever my wife and I stumble across a plant that proves to be a great addition to our backyard wildlife gardens, we like to share our discovery with others. One of our latest discoveries is sulphur cosmos (Cosmos sulphureous).
Over the years we have planted a number of different varieties of cosmos. However, none of have proven to attract as many butterflies, hummingbirds and other pollinators as sulphur cosmos. We have also found the flowers are popular with both bumblebees and carpenter bees.
As such, we have enjoyed watching these rotund pollinators land on cosmos blossoms and ride them downward toward the ground.
We have planted sulphur cosmos in a couple of mass plantings. However, it is purported to grow well in containers also.
We have learned this annual is easy to grow. We are growing them in moderately fertile clay soil. However, the plant has the reputation of being able to grow in a variety of soils ranging from poor to fertile.
The plant’s bright orange and yellow daisy like flowers are stunning. Plants grow two to six feet tall (most of our plants reached a height of four to five feet). The flowers last for a long time. In addition, dead heading will prolong their bloom well into the fall.
Our sulphur cosmos plants have been blooming for several weeks. During that time, we have seen the blossoms visited by a host of pollinators such as ruby-throated hummingbirds, eastern tiger swallowtails, common buckeyes, checkered skippers, gulf fritillaries, cloudless sulphurs, sleepy oranges, monarchs, and others. The most recent addition to the list of butterflies seen on the flowers was a giant swallowtail. This butterfly is uncommon in our neck of the woods.
If you decide to incorporate this ornamental in your garden, I would be very surprised if doesn’t please you as much as it has us.