Herb
Onion
Allium cepa
Varieties We Carry
StandardAllium cepaSuper SweetAllium cepa
Sizes & Pricing
From$1.15
Fresh this week. Last restocked Mar 11.
LightFull Sun
WaterModerate
Mature size1-2 feet × 0.5-1 feet
About Onion
Onion (Allium cepa) is a bulbous biennial herb native to Central Asia and one of the oldest and most widely cultivated vegetables in the world, grown for its pungent layered bulbs, green scallion shoots, and edible flowers. Hundreds of cultivars span a range from mild sweet types to sharp pungent storage onions. Starting at $1.15.
Plant details
- Bloom Season
- Spring
- Flower Color
- White
- Growth Rate
- Moderate
- Foliage
- Deciduous
- Soil
- Sandy, Loam, Well-drained
Best planting months
Recommended forZone 9b · St. Augustine, FL
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F
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JNow
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This monthGood windowOther months
Seasonal care
Bloom season. New foliage emerges. Good planting window.
Active growing season.
Foliage may begin to change or drop. Ideal planting window.
Dormant — drops foliage.
Care essentials
Light
Onions need full sun — at least 6 hours of direct sunlight daily. In NE Florida, plant in an open, sunny bed from September through December for bulb development during the short-day winter season.
Water
Keep soil consistently moist but not waterlogged; onions have shallow roots that dry out quickly in NE Florida's sandy soils. Water about 1 inch per week and use mulch to conserve moisture and suppress weeds.
Soil & Fertilizer
Grow in well-drained soil rich in organic matter with a pH of 6.0–7.0. Amend sandy beds with compost before planting. Side-dress with a nitrogen-rich fertilizer 3–4 weeks after planting to support bulb development.
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Common questions
Is Onion a good plant for St. Augustine?
Onion is a herb for Zone 9b coastal Florida gardens, reaching 1-2 feet × 0.5-1 feet.
Care information verified from
Last reviewed February 2026. Our care guidance comes from trusted horticulture sources and decades of helping St. Augustine gardeners. Conditions here can vary dramatically from one area to the next, so come ask us and we'll tailor it to your yard.