Carbon cycle Did you know these plants can naturally help cool your home down this summer? Adding the right indoor plants can help improve airflow, balance indoor humidity, and make your space feel How to grow Bitter melon Growing Bitter gourd Momordica charantia Naturebring Visit the U.S. Botanic Garden United States Botanic Garden How to Grow Ornamental Flowering Kale Gardener's Path Asafoetida plant (Ferula assa foetida): flowering stem, leaves, seeds and root. Coloured etching by J. Pass, c. 1806, after J. Ihle. Wellcome Collection