Plant Care Great Blue Lobelia

Great Blue Lobelia

About Great Blue Lobelia

Great Blue Lobelia is a herbaceous perennial that may grow 3 to 4 feet tall. Blue flowers first mature in mid-summer and continue into early fall. This plant was selected as the 1993 NC Wildflower of the Year. It has a medium flammability rating.

Taxonomy

Lobelia siphilitica
Lobelia
Campanulaceae
Asterales

Also known as

great blue lobelia, great lobelia and blue cardinal flower

How to care for Great Blue Lobelia

💦 Water

How often to water your Great Blue Lobelia

Water needs for Great Blue Lobelia
0.5 cups
every 9

Great Blue Lobelia 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 Great Blue Lobelia

Water 0.5 cups every
9

Does your plant get direct sunlight?

Select the pot size

5"
☀️ Light

Finding light for Great Blue Lobelia in your home

Light needs and placement for plant Great Blue Lobelia: 1ft from a window
1ft or less from
a window

Great Blue Lobelia love being close to bright, sunny windows 😎.

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

Great Blue Lobelia does not tolerate low-light 🚫.

Select your region to see how the current weather in your area affects the placement of Great Blue Lobelia in your home 🏡.

🪴 Nutrients

How to fertilize Great Blue Lobelia

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

💡 FAQs
⭐ Difficulty Level

Great Blue Lobelia is generally considered an easy-to-care-for plant and makes a great choice for beginners!

How to Grow Great Blue Lobelia →

Benefits of Growing Great Blue Lobelia →

Common Great Blue Lobelia Problems →

Outdoor Care Guide for Great Blue Lobelia →


💦 Water Needs

Great Blue Lobelia 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.

Great Blue Lobelia Water Frequency →

Great Blue Lobelia Root Rot →


☀️ Sunlight Needs

Great Blue Lobelia 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 🏡.

Great Blue Lobelia Light Requirements →

Great Blue Lobelia Direct Sunlight Needs & Tolerance →


🐶 🐈 👶 Toxicity

Great Blue Lobelia is extremely dangerous if consumed. If you, a family member, or a pet has ingested any amount of plant material contact Poison Control, US (800) 222-1222, or your veterinarian immediately. Great Blue Lobelia is not recommended for homes with children, cats, or dogs.


🪴 Soil

Great Blue Lobelia 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 Soil Mix for Great Blue Lobelia →

Best Pots for Great Blue Lobelia →

When and How to Successfully Repot Great Blue Lobelia →

What Are Healthy Great Blue Lobelia Roots →


⬆️ ⬇️ Growth Pattern

Great Blue Lobelia grows vertically and new growth will emerge from the top of the plant.

Great Blue Lobelia Lifecycle →

Great Blue Lobelia Size Guide →

How and When to Prune Great Blue Lobelia →


🌦️ Growing Outdoors
🌱 Propagation

Great Blue Lobelia can be propagated by division into new individual plants.

  • Check to see if there is more than one plant. In some cases they may still be beneath the soil surface. If you feel confident, you may remove the soil to check for baby plantlets below!
  • If there are multiple plants growing, unpot the plant and gently tug the plants apart, being careful not to disturb too many of the roots. They may be connected by large root segments which you may need to break to free the plantlet.
  • Pot up the new plant in well-draining soil
  • Repot the parent plant back into its original pot

How to Propagate Great Blue Lobelia →


🍂 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 Great Blue Lobelia, 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.


Care Summary for Great Blue Lobelia

Great Blue Lobelia

Great Blue Lobelia


Greg recommends:

Water

0.5 cups every 9 days

Placement

< 1ft from a window

Nutrients

Repot after 2x growth

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

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