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Sulphur Cosmos

About Sulphur Cosmos

Sulphur Cosmos is a popular houseplant 🌿 that is isn’t challenging to grow and needs regular watering to thrive. They do best in long-lasting, direct light ☀️ and should be less than 1 foot from a window.

Sulphur Cosmos likes soil that is well draining. You may want to supplement with a gentle, organic fertilizer throughout the peak growing season.

Sulphur Cosmos belongs to the Cosmos genus, and is native to Mexico to Central America.

Taxonomy

Scientific name

Cosmos sulphureus

Genus

Cosmos

Family

Asteraceae

Order

Asterales

Also known as

Sulfur cosmos, Yellow cosmos. and Klondike Cosmos

How to care for Sulphur Cosmos

💦 Water

How often to water your Sulphur Cosmos

Sulphur Cosmos 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
9

Does your plant get direct sunlight?

No Yes

Select the pot size

☀️ Light

Finding light for Sulphur Cosmos in your home

Sulphur Cosmos love being close to bright, sunny windows 😎.

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

Sulphur Cosmos does not tolerate low-light 🚫.

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

🪴 Nutrients

How to fertilize Sulphur Cosmos

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

Browse #Cosmos

💡 FAQs

⭐ Difficulty Level

Sulphur Cosmos is generally easy to care for, though some plant parents report facing challenges with growing it. Check out the reviews down below to read more about their experiences!

How to Grow Sulphur Cosmos →

Benefits of Growing Sulphur Cosmos →

Common Sulphur Cosmos Problems →

Outdoor Care Guide for Sulphur Cosmos →

💦 Water Needs

Sulphur Cosmos prefers for the soil to dry out between waterings and should be watered regularly. Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Sulphur Cosmos Water Frequency →

Sulphur Cosmos Root Rot →

☀️ Sunlight Needs

Sulphur Cosmos requires abundant, bright and direct light. Place it less than one foot from a window to ensure it receives enough light to survive 💪. Select your region to see how the current weather in your area affects the placement in your home 🏡.

Sulphur Cosmos Light Requirements →

Sulphur Cosmos Direct Sunlight Needs & Tolerance →

🐶 🐈 👶 Toxicity

Sulphur Cosmos is not known to cause harm to humans or pets. Regardless, if you, a family member, a cat, or dog has ingested any plant material, please consult a doctor or a veterinarian.

🪴 Soil

Sulphur Cosmos does best in well-draining soil. A good soil will contain lots of organic matter such as coco coir as well as perlite or vermiculite to help with drainage. Adding a handful of perlite to regular store-bought potting soil should do the trick!

Best Pots for Sulphur Cosmos →

When and How to Successfully Repot Sulphur Cosmos →

What Are Healthy Sulphur Cosmos Roots →

💩 Fertilizer

Sulphur Cosmos is a fast growing plant and may deplete the nutrients in its soil over time. Replenish them with a gentle organic fertilizer or compost every 1-2 months depending on your location and season. Fertilize more often during the growing season and in warmer and brighter climates.

How Much and When to Fertilize Sulphur Cosmos →

⬆️ ⬇️ Growth Pattern

Sulphur Cosmos is a clumping plant, meaning new growth will emerge from the soil around the parent plant.

Sulphur Cosmos Lifecycle →

Sulphur Cosmos Size Guide →

🌦️ Growing Outdoors

USDA Hardiness Zone
Sulphur Cosmos can be grown outdoors in USDA Hardiness Zones 2a-11b. Find your local hardiness zone here.

Sulphur Cosmos Temperature Tolerance →

Sulphur Cosmos Hardiness Zones →

Landscaping Ideas with Sulphur Cosmos →

When to Plant Sulphur Cosmos →

How to Plant Sulphur Cosmos →

Where to Plant Sulphur Cosmos →

Winter Care for Sulphur Cosmos →

Best Companion Plants for Sulphur Cosmos →

Is Sulphur Cosmos a Weed? →

🌱 Propagation

The seeds of Sulphur Cosmos can be used to grow new plants! After your plant flowers, any seeds that formed can be collected and germinated in potting soil.

🍂 Yellow Leaves

Yellow leaves aren’t always a reason to panic, and can be a normal part of a plant’s life cycle. Unless brand new leaves are turning yellow or all the leaves change color at once, it’s likely just your plant shedding old leaves.

Overwatering and root rot are the most likely cause of problems in Sulphur Cosmos, since they are sensitive to wet soil. The leaves may also appear to be curling or drooping. Less often, yellow leaves are caused by underwatering, nutrient deficiencies, or pests.

Replace soggy soil with fresh, dry soil and download Greg to make sure your plant never gets overwatered again!

🧐 Troubleshooting

When troubleshooting a sad-looking houseplant, start by checking for signs of distress in its leaves, such as yellowing, browning, or drooping, which can indicate overwatering or nutrient deficiencies.

Inspect the soil moisture; too dry or too wet soil can cause problems.

Ensure the plant is getting the right amount of light, as too much or too little can stress it.

Finally, consider environmental factors like temperature and humidity, and adjust care routines accordingly to revive your plant.