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How to Plant Flowers in Window Boxes

Are you looking for planting ideas for a window box? Wait until you see how to plant flowers in window boxes.

After completing the renovation of our garden shed, we added these adorable stainless steel window boxes with an antique copper finish.

I love how the copper finish looks with the paint color on the shed, don’t you?

New window box planters mean more opportunities to plant pretty plants and flowers.

So let’s warm up the garden shed with some beautiful spring flowers.

Here’s a garden design idea to plant a window box.

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What Should I Plant in My Window Box

There are lots of pretty plants and flowers that can be planted in a window box.

Depending on the location (sun, part sun or shade), you’ll want to design your window boxes accordingly.

Keep in mind that soil and plants carry a lot of weight, particularly after it rains.

So make sure you reinforce the window boxes so they don’t fall off the building.

(It’s happened to me before).

Annuals that I enjoy using in spring window boxes include:

  • Petunias
  • Euphorbia
  • Sweet Potato Vine
  • Geraniums
  • Ivy
  • Vinca
  • Impatiens
  • Bacopa
How to Plant Flowers in Window Boxes

How Many Plants Should Be in a Window Box?

When determining how many plants you should include in a window box, consider the garden design idea that the eye breaks spaces in thirds.

So choose an odd number of plants (3, 5, 7 or 9) and stuff them in the planters.

If the gardening season is short like it is here in my zone 6a hardiness zone, I suggest planting them tightly so you get a full look from the outset.

Staking flowers is important to do when cut flower gardening

How Do You Organize Plants in a Window Box?

Before planting, move your plants around in the window box until you get a look that is aesthetically pleasing.

Be sure to include both flower and foliage plants, but make sure they are balanced and not all grouped together on one side or the other.

Stand back and ask yourself if the window box looks symmetrical.

If it looks good, then pot it up!

How to Plant Flowers in a Window Box

I potted them up with some pretty spring flowers that would accentuate the beauty of the copper planters and add cottage charm to my garden shed.

How to Plant Flowers in a Window Box Planter
Before the window boxes were planted with flowers.

Supplies Needed to Plant in a Window Box

  • plants
  • container
  • potting soil
  • weed fabric
  • gloves
  • scissors
  • plant food
  • shovel or cup
How to Plant Flowers in a Window Box Planter

For this project, the plants I chose are:

  • Geraniums
  • Sweet Potato Vine
  • Bacopa
  • Euphorbia
  • Vinca
Nursery Trip
When I shop for annuals, I don’t mess around. I bring the big truck!

Determine Location

The first step is to determine where the window boxes will be maintained. Does the area receive full sun, part sun, or shade?

Understanding the location will help you choose the right plants.

How to Plant Flowers in a Window Box Planter

Choose Flowers for the Window Boxes

Once the location is determined, it’s time to shop for plants.

If choosing to create a container design with a few plants, it’s important to make sure that they each have the same or similar light conditions as well as water conditions.

So read the plant tags.

Understanding light and water conditions will help you take better care of your plants after the container garden is finished.

Nursery Trip

How to Design a Window Box Garden

While shopping around the nursery, I was looking for plants that would accentuate the planters and could handle lower light conditions.

One of the things I like to do is group my plants together in the nursery to see how they look together.

Are they aesthetically pleasing?

I look at foliage, blooms, plant size, and the overall plant habit.

Because when designing a container garden, it’s important to use the thriller, filler and spiller method of design.

How to Plant Flowers in a Window Box

How to Plant Flowers in a Window Box

  • Gather supplies.
  • If possible, remove the window box and work from a table. In many cases, this isn’t possible, and that’s OK. But it is much easier to pot them on a table if you can.
  • Cut weed fabric to size to fit inside the planter.
  • Add some potting soil with a hand trowel or cup so the plants have some soil to sit in.
How to Plant Flowers in a Window Box
  • Check the planting depth by adding your plants while still in their plastic nursery pots. You want the soil line to match up with about an inch down from the top of the container. If more soil is needed to get the right depth, add more.
  • Remove plants from plastic pots and fan out the roots before setting in the container. This encourages the roots to grow out into the potting soil.
How to Plant Flowers in a Window Box
  • Back fill with potting soil, tamping it down as you go to remove the air pockets.
  • Add a slow-release fertilizer to the container, water, and enjoy!

And that’s it!

Didn’t they turn out beautiful?

How to Plant Flowers in Window Boxes

How Often Should You Water a Window Box

It’s important to note that window boxes can dry out much easier than larger planters.

So frequent watering is a must, particularly during the summer.

Unless you add an irrigation system like this one set on a timer, you may need to water your window boxes 1-2x a day in the heat of summer.

How to Plant Flowers in a Window Box Planter

Keep an eye on your plants to make sure they do not wilt.

Click here for more container garden care tips.

Shed Garden at Sunrise in May

Not Sure What Kind of Container for Gardening to Use?

There are lots of options available to plant in and there are pros and cons of each.

Click here to learn more about the different types of containers for gardening and how to choose one that’s right for you.

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How to Plant Flowers in Window Boxes
How to Plant Flowers in Window Boxes

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  1. Those window boxes are gorgeous…a step up from the cocoa fiber hay racks. Honestly, you can’t beat geraniums in a sunny window box. As long as you deadhead and fertilize they will bloom til frost.

  2. I love the choices of plants you combined to make theses beautiful flower boxes. I was wondering if you have ever discussed how you water your extensive outside gardens? Do you use a sprinkler system? soaker hoses? hoses with a sprinkler wand? Thanks for the wealth of knowledge you share with us!

    1. Funny you ask – I’m sharing a post about how to care for gardens while away on vacation tomorrow that will touch on this very topic! Thank you xoxo