Plant Care Broadstemmed onion

Broadstemmed onion

Also known as

Flat-stem onion


Allium platycaule

How to care for Broadstemmed onion


How often to water your Broadstemmed onion

Water needs for Broadstemmed onion
0.5 cups
every 9

Broadstemmed onion needs 0.5 cups of water every 9 when it doesn’t get direct sunlight and is potted in a 5" pot.

Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Water 0.5 cups every

Does your plant get direct sunlight?

Select the pot size


Check the growing potential in your area

A plant's growing potential is determined from its location, the time of year, and current local weather.

Select a city to check sunlight intensity

Finding light for Broadstemmed onion in your home

Light needs and placement for plant Broadstemmed onion: 1ft from a window
1ft or less from
a window

Broadstemmed onion love being close to bright, sunny windows 😎.

Place it less than 1ft from a south-facing window to maximize the potential for growth.

Broadstemmed onion does not tolerate low-light 🚫.

Select your region to see how the current weather in your area affects the placement of Broadstemmed onion in your home 🏡.


How to fertilize Broadstemmed onion

Nutrient, fertilizer, and repotting needs for Broadstemmed onion: repot after 2X growth

Most potting soils come with ample nutrients which plants use to produce new growth.

By the time your plant has depleted the nutrients in its soil it’s likely grown enough to need a larger pot anyway.

To replenish this plant's nutrients, repot your Broadstemmed onion after it doubles in size or once a year—whichever comes first.

Water Needs
Sunlight Needs
Native Region
Growth Pattern
Growing Outdoors

Care Summary for Broadstemmed onion

Broadstemmed onion

Greg recommends:


0.5 cups every 9 days


< 1ft from a window


Repot after 2x growth

Based on the 4” pot your plant is in, and that it doesn’t get direct sunlight.

Trending in your area

Similar to Broadstemmed onion

Discover rare plants

This plant is popular in