Sweet marjoram (Origanum majorana)
All you need to know about sweet marjoram
Oval gray green leaves on 1- to 2-foot-tall plants. Milder and more floral than oregano. Perennial in zones 8-24; annual elsewhere.
GROWING TIP: Needs especially good drainage. Plants thrive on little to moderate water.
HARVEST TIP: Oil is strongest when the plant is in bud but before flowers open. Cut back to 4 inches tall in late spring, summer, and fall.