Herb
Sweet Marjoram
Origanum majorana · Lamiaceae
Also called: Knotted Marjoram, Annual Marjoram
Sweet Marjoram (Origanum majorana) is a low-water herb well suited to Tucson and the low desert. It's a moderate-growing herb. Expect white to pale pink blooms late spring into summer.
Sweet Marjoram at a glance
- Water use
- Low (established)
- Sun
- Full sun in the cool season; provide afternoon/filtered shade through Tucson's intense May–September heat. Best in 6+ hours of sun October–April.
- Mature size
- 8–18 in tall and 12–18 in wide (compact mounding habit).
- Growth rate
- Moderate
- Bloom
- White to pale pink, Late spring into summer; produces small white-to-pink flowers in knot-like clusters. Harvest leaves before flowering for best culinary quality.
- Cold hardiness
- Frost-tender; damaged below about 30°F. Often killed or knocked back by hard Tucson winter freezes—grow as a cool-season annual or protect/overwinter in containers.
- Soil
- Light, well-drained sandy or loamy soil amended with compost; tolerates Tucson's alkaline soil but appreciates added organic matter. Excellent in containers and raised beds.
- Native range
- Mediterranean region and western Asia (Cyprus, Turkey).
- Best used as
- Culinary herb (milder, sweeter relative of oregano for soups, sauces, meats, vegetables), Container and raised-bed herb gardens, Pollinator plant, Dried herb and tea
- Wildlife
- Flowers attract bees and other beneficial pollinators.
- Toxicity
- Non-toxic and safe for people, dogs, and cats; a common kitchen herb.
How to grow Sweet Marjoram in Tucson & the low desert
Watering
Plant in fall (Sept–Nov) or early spring for the best growth; it is a tender Mediterranean perennial usually grown as a cool-season herb here. Water deeply but allow the top inch of soil to dry between irrigations—roughly every 3–5 days in summer, weekly in winter. Avoid overwatering; it resents soggy soil.
Fertilizer & nutrients
Light feeder. Amend the bed with compost at planting and apply a balanced or all-purpose fertilizer at half strength once a month during active growth. Excess nitrogen weakens the aromatic oils and flavor.
Pruning & care
Pinch tips regularly to keep plants bushy and delay flowering; harvest sprigs just before bloom for peak flavor. Shear back after flowering to encourage a flush of tender new growth.
Notes
Sweeter and less pungent than common oregano. In Tucson it performs best as a fall-through-spring herb; summer heat and reflected light stress it, so site it with afternoon shade or grow in a movable pot. Excellent for container culture on patios.
Sources: University of Arizona Cooperative Extension / Pima County Master Gardeners herb guides; Arizona Master Gardener Manual (Lamiaceae herbs); SummerWinds Nursery Arizona herb guide