青草 (qīngcǎo) means "green grass" and is a compound noun combining 青 (green/blue-green) and 草 (grass). It frequently appears in poetry and literary descriptions of nature, evoking fresh, lush scenery. It is more descriptive and literary than simply saying 草.
春天来了,山坡上长满了青草。
Chūntiān lái le, shānpō shàng zhǎng mǎn le qīngcǎo.
Spring has come, and the hillside is covered with green grass.
孩子们在青草地上开心地奔跑。
Háizimen zài qīngcǎo dì shàng kāixīn de bēnpǎo.
The children were happily running on the green grass.
雨后的青草散发着清新的气味。
Yǔ hòu de qīngcǎo sànfā zhe qīngxīn de qìwèi.
The green grass after the rain gave off a fresh scent.