How to Grow Cosmos: A Complete Guide to Planting Times and Methods

Cosmos comes in fairly rich flower colors and has considerable ornamental value, making it one of the most popular planting varieties on the flower market in recent years. So how do you grow cosmos? What are the planting times and methods for cosmos?

1. When is the planting time for cosmos?

The planting time for cosmos depends on the propagation method chosen. Generally, cosmos can be propagated both by sowing seeds and by cuttings.

1. Time for propagating cosmos by sowing seeds

If you choose to propagate cosmos by sowing, you can sow in either spring or autumn. For spring sowing, sow from the end of February to early-to-mid March; the first flowers usually open in May-June, and the second flush opens around the time of Frost's Descent. Because summer temperatures are scorching hot, there are fewer flowers then.

For autumn sowing, you can sow after the Start of Autumn, and flowers will appear in about 2-3 months of growing.

2. Time for propagating cosmos by cuttings

Considering the survival rate of cosmos cuttings, the best time for cuttings is usually around April each year. Select young cosmos shoots for cuttings; with proper care, they will root in about half a month.

2. How do you grow cosmos? What planting methods are there?

1. Growth habits of cosmos

To grow cosmos well, you first need to understand its growth habits.

The growth habits of cosmos can be summed up simply as: “loves light, loose soil, and dislikes waterlogging and overly fertile soil.”

2. Planting methods for cosmos

(1) Prepare the planting soil or plot

Cosmos can be grown both in pots and in the open ground. Before sowing or taking cuttings, it is recommended to sun the soil to do a good job of preventing pests and diseases.

After sunning the soil, apply a small amount of flower fertilizer to the soil, water until the soil is moist, and place it in a cool, ventilated spot.

Then you can choose to sow seeds or take cuttings to plant cosmos.

(2) Cultivation management

After planting cosmos, if you grew it from seed, transplant the seedlings when they are about 5 cm tall. At transplanting, water once a day, but do not water too much each time; just keep the soil moist.

Also, do not fertilize frequently. Slightly poor soil is more conducive to the growth and flowering of cosmos.

Finally, do a good job of pest and disease control. When growing cosmos, there is nothing else to fear but aphids, so be sure to ensure ventilation and light in the cosmos growing environment. If aphids appear, you can dilute dish soap with water at a 1:100 ratio and spray it, 2 times a day.

(3) Care during the flowering period

When cosmos reaches its flowering period, the main tasks are just two: first, give them plenty of sun; second, keep the soil loose and not waterlogged. If it is summer, avoid direct sunlight and move them to a spot with diffused light.

Overall, the planting method for cosmos is fairly simple and does not require much special care and management, making it suitable for people who love growing flowers but are rather busy. Friends who are interested can take action right away and try growing a pot of cosmos!