A window planter includes a first compartment including a first sidewall and a second sidewall. The first compartment is configured to house a first group of plants. A second compartment is slidably coupled to the first compartment. The first compartment includes a first outer sidewall. The second compartment is configured to house a second group of plants separated from the first group of plants by the first sidewall of the first compartment. A third compartment is slidably coupled to the first compartment. The third compartment includes a second outer sidewall. The third compartment is configured to house a third group of plants separated from the first group of plants by the second sidewall. At least the first compartment and the second compartment are configured to be secured to a window frame.