芦 rarely stands alone. Common compounds: 芦苇 (lúwěi, reeds), 芦笋 (lúsǔn, asparagus), 芦荟 (lúhuì, aloe vera), 芦花 (lúhuā, reed catkin), 葫芦 (húlu, gourd — note the neutral tone shift).
memory
The grass radical 艹 over 户 (door) — picture reeds growing tall enough to form a doorway / curtain at a marsh's edge. (Phonetic component is actually 户 hù, but the image works as a memory hook.)
