Please not vinca--it's invasive.

I would try stonecrop--drought tolerant, native, grows in sun or shade, deer resistant:


http://www.chesapeakenatives.org/Chesapeake_Natives/Sedum_ternatum_Wild_Stonecrop.html

Advice about watering them is spot on. I suggest you get a potting soil that indicates it's got water retention crystals. I'd also avoid the impatiens this year. There's an outbreak of downy mildew that's devastating them http://www.sciencenews.org/view/generic/id/349064/description/Disease_threatens_garden_impatiens . Coleus, wax begonias and potato vines would be nice.

Sweet potato vines are great for window boxes. Add some impatiens or portulaca for color

I have window boxes in that spot. I get afternoon sun. Do you? If so, try: coleus, sweet potato vine, petunias, pentas, geraniums.

My no. 1 tip is to add water crystals or granules to your potting mix so you don't have to water everyday.

I love when there are vinca vines in addition to colorful flowers in the window boxes. They hang down and look so graceful and pretty.

And figure out how you are going to water them before you put them in.

Facing north, your light is probably not very good. Go with plants that don't require full sun. Impatiens are probably a good bet.

My neighbors have window boxes and every July, the flowers have gotten scorched, dried out, and died. Make sure you provide them plenty of water.

You can't put in tulips now. They've already bloomed and are gone. Tulip bulbs need to be planted in the fall. Impatiens, lilies, begonias, bleeding heart. Remember to use a good soil combined with a potting mix.

Tulips or pansies

Begonias, impatiens, maybe fuchsia come to mind.

ops, I mean cedar.

I am new to gardening and just put window boxes on the front widows of my house. They are pine and my house is facing North.

What should I put in them?