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Window Box Gardening

Category Container
Window Box Garden
Protecting your home's exterior from soil and moisture is important, when gardening in containers attached outside your windows. This is a guide about window box gardening.
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By 0 found this helpful
April 26, 2006

Window boxes are a great space saver and an easy way to add color and beauty to the outside of your home. They come in hundreds of colors and architectural styles, and for budget-minded, do-it-yourselfers, typing "free window box plans" into any search engine will result in hundreds of free plans. Here are some things to consider before you buy, build or install window boxes.
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Color & Style

There are several things to keep in mind when buying or building window boxes. To keep with your home's architectural integrity, select a style of window box that will compliment your home's exterior. A Victorian era planter made from wrought iron, for example, will look garish on a contemporary home with sleek, modern lines. Dark colored boxes and boxes constructed from metal can heat up quickly and damage plants if your window gets a lot of sun. As a general rule, choose simple designs and solid colors to compliment your home's exterior and the plants inside the box, not distract from their beauty.

Size & Placement

Window boxes tend to look best if they are slightly wider than the window they are placed under. A standard box is about 3 feet long, and should be not less than 4 inches wide. Proportionally, try to select a box that is approximately 20-25% of the height of your window. If you have shutters, window boxes should be long enough to reach the mid point of each shutter or extend at least 2 to 3 inches past them on either side. Boxes should be at least 6 inches deep and contain several holes for drainage. Deeper boxes will accommodate more plants, and the greater the volume of soil they can hold, the less quickly they will dry out.

Installation

Window boxes should be anchored securely to the windowsill with heavy-gauge wire or hooks. Install "L-shaped" or other mounting brackets on the bottom front of extra long boxes and screw them directly into the wall. Window boxes under very narrow window sills should be mounted to the wall with brackets fastened to the bottom or back of each box. Make sure to mount the box in such as way that it remains easy to access for removal and maintenance.

Overhead Etiquette

If you live in an apartment where your window boxes will be mounted on a railing above a downstairs neighbor, fasten a piece of rain gutter to the bottom of the window box to divert water away from dripping onto your neighbors terrace. An alternative is to place the window box into a deep drip tray to catch draining water.

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Plants and Planting

Fill your planter box to within an inch of the top with a mix that contains 50% compost and the rest a mixture of peat and vermiculite or perlite. This will provide your plants plenty of nutrients while minimizing the weight of the soil in the planters. A singe layer of packing peanuts at the bottom will help increase drainage. Make sure you moisten the soil well before planting. If you're using a terra cotta box, soak it in water for an hour before planting so that the clay doesn't absorb the water meant for the new plants.

Window boxes look wonderful filled with a solid wave of one color or several plants are combined. For a lush look, stagger your plants in the box. Follow the basic rules of container gardening using taller plants in back, trailing plants along the front and sides and bushier plants to fill in the spaces in the middle. If you want to be able to change plants easily every season (e.g. spring bulbs, summer geraniums and fall mums), keep plants in individual pots or line the boxes with plastic liners so that plants can be easily lifted out and removed (don't forget drainage holes).

Although we normally associate window boxes with flowers vegetables and herbs grow well in them, too. Try these vegetables: cherry tomatoes, Swiss chard, radishes, lettuce and peppers. Herbs that grow well and look good in window boxes include oregano, parsley, rosemary, thyme, lavender and chamomile.

Maintenance Tips

Window boxes need to be watered frequently, especially if they sit in direct sun for most of the day. Plan on watering at least twice a day (morning and evening) during how or windy days. Mulching around the plants will help hold in moisture, but the soil should never be allowed to completely dry out.

Add a half-strength liquid fertilizer every two weeks throughout the season to compensate for the confines of space and that fact that nutrients are washed out of the soil with frequent waterings.

Deadhead spent flowers for continuous blooms and removed any plant debris to discourage fungal growth. If plants start to get long and leggy, pinch them back to encourage bushier growth.

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Questions

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October 7, 2010

I have just bought 2 wonderful wood window boxes with liners for my shed. They are great but came with no hardware or instructions on how to mount them. The shed is Amish built, wood construction with siding cover. I need help on how to attach them to my shed. They are cedar and not super heavy. Any help is appreciated.

By Hilda from Alexandria, VA

Answer Was this helpful? Yes
October 7, 20100 found this helpful

I would check at a home improvement or hardware store, they sell brackets that should work.

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October 8, 20100 found this helpful

If nothing else works, grab some metal shelf brackets. Two per box should work, unless they are super long. Then I would add three per, don't forget to screw the bracket to the window box also.

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October 8, 20100 found this helpful

I'd make some heavy wooden brackets that are painted the color of the shed, so they won't be too noticeable. The window boxes may not be too heavy now, but once they are filled with dirt, plants, and some water, they will be much heavier than you think they could possibly be.

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By 0 found this helpful
May 15, 2007

I'm looking for wooden window boxes and the chunky brackets, like you see on homes in older neighborhoods. I need several for single windows as well as double and triple windows. I've looked at the lawn and garden shops in the Kettering and Dayton Ohio area with no luck.

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Gwen from Dayton, OH

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By guest (Guest Post)
May 17, 20070 found this helpful

I would just bet you could find someone in the Ohio Amish communities who would make some for you. If you have such a community in your area, there will surely be a woodwork shop or two. If not, come on up to Knox, Wayne, Ashland, or Holmes Counties and take a drive. It would help if you have measurements and amounts with you. Don't be afraid to bargain a bit, either. Remember, though, Sunday's are very strictly a "no business" day for the Amish.

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By guest (Guest Post)
May 18, 20070 found this helpful

Our local Wal*Mart has them.

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By 0 found this helpful
April 20, 2014

How do you make wood window boxes?

By bigjohn

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By 0 found this helpful
June 17, 2009

I want to know what style window box would be appropriate for my 1940 Cape Cod, brick home. I would like to put it in the front window. I have cappuccino colored shutters and brown brick.

Hardiness Zone: 6b

By jfpicini from Fair Lawn, NJ

Answer Was this helpful? Yes
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