Why Americans don't pronounce the H in herbs [video]

A related video on the different vegetable names between the US and the UK:

America vs. Britain: Vegetable Names: https://www.youtube.com/watch?v=XF0w5L0ZsVs

Eggplant - Aubergine

Zucchini - Courgette

Arugula - Rocket

Rutabaga - Swede

Scallion - Spring Onion

Cilantro - Coriander

Beets - Beetroot