Learn Turkish: Korunaklı bir sera kurduk, çünkü tohumların yeşereceğini umuyoruz. - We built a sheltered greenhouse because we hope that the seeds will sprout.

It comes from the root verb korumak (to protect). Adding the reflexive suffix makes it korunmak (to be protected). From there, it becomes the noun korunak (a shelter), and finally the adjective suffix -lı turns it into korunaklı (having a shelter, or sheltered).

Why is it tohumların yeşereceğini instead of just tohumlar yeşerecek?

To say 'that the seeds will sprout', Turkish uses an embedded noun clause acting as the object of umuyoruz (we hope). The subject of the clause (tohumlar) takes the genitive suffix -ın, and the verb takes the future participle -ecek plus the possessive -i. Finally, the buffer -n- and accusative -i are added because this whole clause is the direct object of the main verb.

This lesson focuses on yine de (nevertheless). Could we use it in this sentence?

No, because çünkü (because) sets up a logical cause and effect. Yine de is used for contrary or unexpected consequences. To use yine de, the situation would need to be opposed, for example: Tohumların yeşermeyeceğini düşünüyoruz, yine de bir sera kurduk (We think the seeds will not sprout, nevertheless we built a greenhouse).

Does the verb yeşermek (to sprout) come from the color green ()?