Growing Guide
How to Grow Bulb Onions
Everything you need to know about growing bulb onions — from planting to harvest.
Spring/Fall
Fall-Spring
Winter
Days to Harvest
90–120
Spacing
4–6"
Method
Transplant
Trellis
No
Where Bulb Onions Grows Best
Bulb Onions can be grown in 12 out of 12 USDA hardiness zones. Click a zone to see specific planting dates.
Growing Bulb Onions
Bulb Onions typically takes 90–120 days from planting to harvest. Start seeds indoors and transplant once established. Space plants 4–6" apart for optimal growth.
Common Pests
Create Your Own Plant Playlist
Use our kit themes as a starting point and build a custom planting plan for your garden.
Create a PlaylistFrequently Asked Questions
How long does it take to grow Bulb Onions?
Bulb Onions typically take 90–120 days from planting to harvest. Timing varies by zone and growing conditions.
Can I grow Bulb Onions in containers?
Many gardeners successfully grow bulb onions in containers. Use a pot at least 12-18 inches deep with good drainage. Container plants may need more frequent watering.
What are the best companion plants for Bulb Onions?
Bulb Onions grow well alongside many garden plants. Check our kit pages for curated combinations that include bulb onions.
Grow Bulb Onions in Your Zone
Select your USDA hardiness zone for zone-specific planting dates and tips.