What Causes Cosmos Not Flowering

Cosmos is one of the most colorful and beautiful flower in the Compositae family. Cosmos sulphureus and Cosmos bipinnatus which are famous among gardeners are two common species of it. Cosmos are herbaceous perennial plants or annual plants growing 0.3–2 m (1 ft 0 in–6 ft 7 in) tall. The leaves are simple, pinnate, or bipinnate, and arranged in opposite pairs. The flowers are produced in a capitulum with a ring of broad ray florets and a center of disc florets; flower color is very variable between the different species, such as C. sulphureus has yellow, orange or red flowers but C. bipinnatus has white, rose or pink flowers.

The Information below will explain what causes Cosmos not flowering.

What Causes Cosmos Not Flowering

What Causes Cosmos Not Flowering?

Cosmos is one of the easy types of growing which can survive in many kinds of environment. However, some gardeners fail to make their cosmos bloom. The information below may be useful for the gardeners whose cosmos can’t bloom.

Redundant nutrition due to fertilization

One of the reasons that causes cosmos fail to bloom may be the gardeners are providing too much fertilizer leading to redundant nutrition for the plants, especially, nitrogen. In fact, nitrogen is essential for the development of cosmos but if it’s too much, it will become a negative factor which makes cosmos can’t obtain a normal growing process. One signal of over nitrogen is cosmos leaves are healthy but it can’t flower.

If a 20-20-20 fertilizer, with 20% nitrogen, phosphorous and potassium, is your current fertilizer, you should try a new one with less nitrogen. Gardeners can try fertilizers with names like “More Bloom” or “Bloom Booster”, because they are made with less nitrogen and more phosphorus than others aiming at helping cosmos to bloom beautifully. Bone meal is also encouraged to support cosmos bloom.

When planting, you can add fertilizer immediately. You can also provide organic compost because most cosmos do quite well in this fashion. Besides, gardeners could give their plants at boost once a month with a non-chemical fertilizer, like fish emulsion with as a 5-10-10 formula.

Planting Old Seeds

Another reason that makes cosmos fail to bloom is gardeners use the old seeds in planting. Before using, make sure you check all the seeds carefully. Cosmos seeds couldn’t be stored more than a year.

Cosmos Not Reach Maturity

Some gardeners forget about one important thing that is it takes seven weeks for cosmos to bloom. Therefore, if your cosmos doesn’t bloom, it may be due to it doesn’t reach its maturity to produce flowers. Check the tips to see if they are starting to produce buds before getting too worried.

Cold and Wet Weather

Cosmos can’t flower may lays in their preference for dry weather, they actually aren’t able to tolerate long periods of cold and wet weather. Be patient and check this information before get worried. They may still bloom, just later than usual.

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