True leaves of the Cosmos flower

Many of you might be wondering what is the meaning of "true leaves". Well, It's simple. When a seed starts to grow, two-sets of identical leaves will form first. Then after a few days, a third kind of leaf ,or leaves, will emerge looking totally different from the first two leaves. That is the true leaf.

True leaves of Cosmos: small and thin emerging between the first leaves.

When the true leaves come out, that is the perfect time where you can start transplanting them to bigger pots.

These are my Cosmos on their 18th day of life and approx. 5 weeks to go until they can start flowering.