Frequently Asked Questions

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Cowbell is unlike any other self-watering product you've used before!

Cowbell's pressure-regulated reservoir and lid valve keeps water suspended in a precise vacuum which means water doesn't drip by itself.

Cowbell's natural porcelain cone with precision-pore technology allows water to diffuse through only as your plant needs it. 

Plant roots and soil draw water from Cowbell on-demand using natural biology and physics processes like root pressure, capillary action, cohesion tension and water diffusion.

Once the pressure inside the reservoir reaches a certain threshold, the lid valve automatically equalizes the pressure. This means your plant roots never have to work too hard to draw water from the reservoir, while also preventing Cowbell from dripping unnecessary water into your plant.

No over-watering! No root rot! No water waste!

Science is awesome.

Plants and planters are not included. When you order a Cowbell Self-Watering Kit, you will receive our patent-pending watering spike, a 750 mL reservoir, and a pressure-sensitive airtight lid. You can use Cowbell with a potted plant you already have.

We're happy to help recommend plants if you're new to houseplants! Just email us at

Every plant has different thirst needs, which is also highly dependent on the type of soil it lives in, the type of container it lives in, as well as the surrounding temperature and humidity. 

In general, one 750 mL Cowbell should keep most pre-watered houseplants in up to 8" planters hydrated for at least 2 weeks. Two 750 mL Cowbells should keep houseplants in up to 10" planters (3-4 gallons) hydrated for at least 2 weeks. One 250mL Cowbell Mini should keep most pre-watered houseplants in 3-5" planters hydrated for up to 2 weeks. 


Recommended # of 750mL Cowbells by Plant Container Size

  Container Inner Diameter (inches)
4" 5" 6" 7" 8" 9" 10" 11"+
Container Height (inches)
5" 1 1 1 1 1 1-2 2 2-3
6" 1 1 1 1 1-2 1-2 2 2-3
7" 1 1 1 1 1-2 1-2 2 2-3
8" 1 1 1 1-2 1-2 2 2-3 3
9" 1 1 1 1-2 2 2 2-3 3
10"+ 1 1 1 1-2 2 2-3 2-3 3+


- Cowbell may require a refill before 2 weeks if your plant has been chronically underwatered or is in full direct sun, or outdoors.

- Cowbell will not overwater your plant. Plants trained on Cowbell only drink when thirsty. That means more Cowbells per plant offers more even water distribution and keeps your plant hydrated longer, so 2 Cowbells in a 6” x 6” planter could last over a month.

- We recommend more Cowbells if your plant is tropical or flowering. 

Cowbell works well with any plants that grow in a soil-based medium. We do not recommend Cowbell to be used with very loose growing medium such as leca clay balls, moss-only mixes or bark-based orchid mixes. You are certainly welcome to help us experiment, and if it doesn't work, we're happy to refund your purchase.

If you're new to houseplants and would like recommendations, feel free to email us at or text us at 1-888-98-PLANT.

Cowbell will work for outdoor container plants. However, if you are using in a container garden or in a larger planter, your plant may finish its Cowbell in less than 2 weeks.

Similarly, Cowbell may not last 2 weeks if your plant lives in direct full sun for more than 5 hours a day or is in extreme outdoor conditions (dry like Arizona, humid like South Florida, etc). 

Great question! Watering globes empty out in a few days while Cowbell can last over 2 weeks, making it the longest-lasting self-watering device out there. Watering globes usually also have a constant drip speed because their reservoirs are not air-tight. 

Cowbell's 750 mL reservoir is the largest on the market, and our patent-pending air-tight lid and watering spike allow plants to only drink when thirsty. 

We know every plant is unique so Cowbell does not have a constant drip speed. That means it will never over-water your plants. 

Cowbell does not have any electronic components and only uses natural physics technology and plant biology! You do not need any apps to use Cowbell.

1. If your plant hasn't been watered for at least one week, please water your plant before using Cowbell. A good rule of thumb is to give it 20% of the size of the container of water.

2. Twist and tighten the spike onto the water reservoir until you can no longer twist, and the silicone ring is entirely covered.

3. Bury the spike into damp soil close to the plant trunk or main root system. 

4. Fill your reservoir with clean water. Let the system settle for 10-15 minutes with the lid off. If your soil is already very moist, you only need to wait for 5 minutes with the lid off. This allows the spike to saturate and form a connection with the soil and root system. 

5. Top up any water that may have drained from step 4 with clean water.

6. Press the lid securely onto the reservoir to form an airtight seal. You should no longer be able to see the silicone ring. If you leave the lid off or if the lid is not tightly secured, then your reservoir will lose its vacuum seal and drain out in 1-2 days from pure gravity pushing down on the water which will cause overwatering. So please make sure to seal your system with the enclosed lid to allow your plant to draw water from Cowbell only as needed.

6. Check for any air leaks. You should not see any big air bubbles popping up in your reservoir at regular intervals (e.g. every 30 seconds). If you see big air bubbles at regular intervals, please check the above steps again and make sure all your seals are securely sealed. 

The Cowbell spike is ~5.5 inches long, and we recommend at least 5 inches of soil depth so your spike does not wobble around and your self-watering system can stay stable and anchored.

We recommend burying the spike so you can no longer see the white clay core. 

You'll want to ideally bury the spike as close to the plant trunk or main root systems as possible. If your plant has deep established root systems or are somewhat root bound, we recommend burying your spike all the way into the container until you can no longer see the top of the spike at all. 

If you gently plant the spike into your container, your roots won't be damaged. But if you feel any significant resistance, you can find another spot in the container.

We recommend filling your reservoir with clean, filtered water. If you wish to use another solution, there is the possibility that non-soluble particles could plug up the watering spike and slow down your plant's ability to drink from Cowbell. 

If you use a non-water solution and you find that your spike is not draining well, please twist the spike off your Cowbell and scrub the inside and outside well with a brush. 

Cowbell does not need to be cleaned regularly to work. But if you'd like for it to look pristine, it is easy to clean!

If you use Cowbell outdoors or in direct sun, or if you fill your Cowbell with rainwater, you may find some natural algae growth in the reservoir after 1-2 months.

We recommend twisting off the spike and using a bottle brush or squeegee to clean the reservoir with soap and water.

The spike and cone are dishwasher safe but you can also rinse it by hand or clean it with a scrub brush if you find that anything has plugged the ceramic cone.

We don't recommend putting the reservoir in the dishwasher as it will cause warping at extremely high temperatures. 

If you're using one Cowbell Classic 750mL in a 6-8" diameter planter or one Cowbell Mini 250mL in a 3"-5" diamter planter, and the plant was severely underwatered prior to Cowbell, it is possible for your very thirsty plant to drink up all the water in a few days. This is normal. 

If there is no water leaking from your container's drainage hole, then your plant was likely just extremely thirsty. Please refill your Cowbell and your plant should drink at a more regular pace the second or third time. 

However, if your plant was watered generously prior to using Cowbell, and your Cowbell is draining in a day or less, then there is most likely a leak in your system. Cowbell works by creating a vacuum seal inside the reservoir, so water should not be quickly dripping out by itself (after about the first 10-15 minutes when the pressure is equalizing). 

Please take Cowbell out of your plant and check the following seals:

1) Is the spike twisted tightly onto the reservoir? If no, please twist it tightly onto the reservoir until you can't twist anymore to create a seal. You should no longer be able to see the silicone ring.

2) Is the lid pushed down tightly onto the reservoir? If no, please push it securely onto the reservoir until you can no longer see the silicone ring.

3) After the above, wait about 10 minutes and check if your spike still dripping water at more than 10 drips per minute? If it's no longer dripping water, you can safely put Cowbell back into your plant!

If you still see Cowbell dripping water are more than 10 drips per minute after following the above, please email us at or text us at 1-888-98-PLANT and we'll figure out what is going on and make it right! Each Cowbell goes through quality assurance before shipping out to you, so we will make sure your Cowbell is working properly or refund your purchase and ship you out a new one.

4) Please also make sure you do not see air bubbles moving upward inside the bottle at regular and quick intervals (e.g. one bubble every 30 seconds). If you see this, there is an air leak somewhere in your system. Repeat steps 1-3 to make sure there are no air bubbles. 

Standard shipping is currently 5-8 days within the United States. If you require faster shipping, you will see 2-day and overnight options during checkout.

In stock items ship same day if order placed before 4pm ET (US). Items ship next day if placed after 4pm ET (US).

You will receive an email with tracking information when your Cowbell leaves our Florida warehouse!

Enjoy peace of mind with our 14-day return policy for any unused items in its original packaging.

Please see Returns & Exchanges for more details.

Contact us any time at if you have any questions or concerns!

If Cowbell isn't working for your plant, please email us at and we'll make it right!

Otherwise, enjoy peace of mind with our 14-day return policy for any unused items in its original packaging. Simply send it back within 14 days from the date of receipt, and we'll issue a full refund.

Send returns to:

Cowbell Plant Co (Returns)

1701 NW 84th Avenue, Suite D12.

Miami, FL 33126

We are currently not shipping outside of the US and Canada. However, if you would like to place a large order and you reside outside the US, please email us at and we'll do our best to work with you!

For custom orders, please email us at and include the following:

  • What product(s) you are interested in?
  • How many would you like? 
  • The zipcode for your shipping address