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Onion (Allium cepa), Herb
Herb

Onion

Allium cepa

Traits

Pollinator FriendlyZone 9a Hardy

Varieties We Bring In

Super SweetAllium cepa
Sizes & Pricing
From$1.15

Last received Jul 19, 2026.

We bring this in seasonally, so what is on the lot changes week to week. A received date shows when it last came in, not that it is here today.

Call (904) 471-0440 to confirm this plant and size before you make the trip.

LightFull Sun
WaterModerate
Mature size1-2 feet × 0.5-1 feet
Visit Nursery

Pet toxicity: Toxic to dogs and cats

Pet safety guide

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.

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

Recommended months: March, April, May, September, October.

January, other month
February, other month
March, good window
April, good window
May, good window
June, other month
July, other month
August, other month
September, good window
October, good window
November, other month, this month
December, other month
This monthGood windowOther months

Seasonal care

Bloom season. New foliage emerges. Good planting window.

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. Mature size: 1-2 feet × 0.5-1 feet. Light: Full Sun. Water needs: Moderate. Recorded hardiness zone: 9a.

What is the recorded pet toxicity for Onion?

Toxic to dogs and cats

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.