Cosmos is a very cute little annual plant, very trendy nowadays.
Key Cosmos facts:
Name– Cosmos
Family– Asteraceae
Type– annual
Height– 8inches (20cm) to 5feet (1.5meters) depending on the variety
Exposure– full sun
Soil: ordinary, rather light and well drained – Flowering: end of spring → mid-fall
A very easy plant to succeed in growing, the blooming is abundant and its decorative effect is guaranteed.
Sowing Cosmos
In spring, right from the middle of the month of April, choose a full sun location to sow your cosmos.
If you live in areas that are farther up North, best sow starting from the month of May.
In summer, it is always possible to plant your cosmos plants purchased in a nursery pot, but the most common technique is to sow them directly from seed.
- After having sown the seeds, water regularly to ensure that the soil remains damp.
- Once seedlings have sprouted well, you may thin them to give breathing space to your young plants. This means removing those sprouts which are too weak and too crowded together.
Just like the aster, ordinary soil mixed with a bit of soil mix is perfect.
- Avoid compact and heavy soils that would retain water instead of releasing it to the plant.
- To nicely cover a surface, plant around 8 or 9 flowers to a square yard (1 m²).
Care and pruning of cosmos
Easy to grow, cosmos only asks for very little care.
For long stemmed varieties, feel free to stake them to avoid having them double over in case of wind.
Deadheading will help renew blooms. It also makes the flowers seem perpetually fresh!
- Note: if you want seeds, let a few flowers mature and dry out.
All there is to know about cosmos
A plant for flower beds, edges or rocky land, cosmos is spectacular from spring to fall thanks to its generous blooming which constantly renews itself.
An easy annual, there are many different varieties and species which makes for just as many shapes and colors.
As for pests and diseases, Cosmos is rather something of a paradox:
- It attracts aphids away from other plants, thus protecting them. This makes it easier to use as a decoy to eradicate early aphid colonies.
- Conversely, it repels certain butterfly pests, like large white, from laying eggs in the area. But it still shares its nectar to them willingly.
Common varieties of cosmos
These can be divided into three large groups, for the most common flowers
- Cosmos bipinnatus– the most common one, with white, pink or red flowers.
- Cosmos sulphureus – the hues from these vary from yellow to orange.
- and finally, Cosmos caudatus – a more wispy variety native to South America
Not a very hardy plant, cosmos cannot withstand temperatures below freezing. This goes for all varieties. It explains why it must be grown as an annual in cold climates.
- In warm climates, cosmos will grow to a bushy 4 feet tall (1.30 m), and has a lifespan of about 8 months.
Cosmos, beautiful edible flowers
From the three groups mentioned above, only two are traditionally regarded as edible: Cosmos sulphureus and Cosmos caudatus.
- Pick young leaves and flowers and add them to chop suey.
- Sprinkle a few petals to decorate a colorful salad bowl!
The most common Cosmos family, Cosmos bipinnatus, is not considered edible. Since it isn’t toxic in any manner though, it’s still very safe to grow around children and pets.
Smart tip about cosmos
Cosmos is one of the favorite flowers of bees and other beneficial insects.
Images: Pixabay: Annca, Ilona, Hartono Subagio, Sonja Kalee
