Cosmos bicolor, as lovely a flower as it is with the vibrant shades it has and simple to grow, thrives when seeds are employed in propagating it. In terms of successful germination and robust cultivation, do the following.

Number of Seeds	15-20 Seeds
Sowing month	Feb to Oct
Blooming Month	April To Dec
Temperature	Above 30C
Sun	Full sun except may june

First, choose superior cosmos bicolor seeds from a quality supplier. Second, choose a soil mix that drains well and has good drainage, ideally sandy and light. Cosmos plants are not necessarily demanding when it comes to soil fertility levels, thus, fertilize cautiously. Instead, make the soil ready to plant in full sunlight as these flowers open up best when exposed to warm temperatures.

Next, sow the seeds on the surface of the soil. Press them lightly into the soil but not deep because cosmos seeds require light to grow. Lastly, water the soil lightly so the soil is damp but not wet. It will sprout in seven to ten days if the temperature ranges from 70°F to 80°F.

As soon as seedlings appear, give them plenty of growing space by keeping them apart. Space them 12 to 18 inches apart if possible. Keep them watered regularly but not too much, and in any case ensure the soil is moist but never water-logged. And remove each weed that will vie with it for nutrients and light.

To promote heavy blooming and sturdy stems, seedlings new to the game must be pinched when reaching six inches high. This serves to promote full growth and not legginess. In addition to this, do not feed too much, as excessive amounts of nitrogen give leaves but scant flowers. Instead, allow plants to thrive with relatively low-nutrient soil.

As cosmos bi-colors are flowers, remove wilted flowers frequently by deadheading. This simple project extends the flowering season by inducing prolonged flowering. Also, stake occasionally taller varieties, particularly windy spots. As soon as infestation or disease is noticed, treat them with organic pesticides like neem oil or insecticidal soap.

Let some of the flowers go to seed at the end of the season. Cut the heads off when they have turned brown and are completely dry, and dry them in a warm, cool place. Sow the harvested seeds the following season for a further spectacular show of cosmos bicolor.

By following these instructions, you should be able to easily grow cosmos bicolor from seed and enjoy their lovely loveliness all summer long. With hardly any effort, these resilient flowers will bring a splash of color to your garden year after year.