Plant Care Mexican aster

Mexican aster

3.4 out of 5 (5 experiences)

Mexican aster has a Fast grower plant personality Fast grower
Mexican aster has a Browns easily plant personality Browns easily

Also known as

Garden cosmos, Cosmos, Mixed seashell cosmos, Cosmos (Sensation Mix) and Cosmos 'Sensation Mix'


Cosmos bipinnatus

How to care for Mexican aster


How often to water your Mexican aster

Water needs for Mexican aster
0.5 cups
every 9

Mexican aster 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.

Calculate water needs of Mexican aster

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 Mexican aster in your home

Light needs and placement for plant Mexican aster: 3ft from a window
3ft or less from
a window

Mexican aster may have difficulty thriving, and will drop leaves 🍃, without ample sunlight.

Place it less than 3 feet from a south-facing window to maximize the potential for growth.

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


How to fertilize Mexican aster

Nutrient, fertilizer, and repotting needs for Mexican aster: 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 Mexican aster after it doubles in size or once a year—whichever comes first.

Care Summary for Mexican aster

Mexican aster

Mexican aster

Greg recommends:


0.5 cups every 9 days


< 3ft from a window


Repot after 2x growth

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

What other plant parents say

Mexican aster has a Fast grower plant personality Fast grower 3
Mexican aster has a Browns easily plant personality Browns easily 2
Mexican aster has a Survivor plant personality Survivor 1
Mexican aster has a Blooms easily plant personality Blooms easily 1
Sunrose365 avatar
leaf-1 5 Plants
xp 80 XP
globe Martinsburg, West Virginia

It’s got a great over turn rate!

Fast grower Fast grower
Janelle avatar
leaf-1 6 Plants
xp 94 XP
globe San Antonio, Texas

Bloomed nice just hard upkeep

Browns easily Browns easily
Nasya avatar
leaf-1 5 Plants
xp 150 XP

i got the seeds as a gift and she sprouted within a week (hence her name)

Fast grower Fast grower
Survivor Survivor

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