Gardening in limited spaces doesn't mean compromising on beauty. A window box can host a stunning array of flowers from spring through fall, especially if you select the right varieties.
If you're seeking ideas for spring window boxes, focus on flowers to plant in April. Introducing these options now will yield a lively show that brightens your space well into summer and fall. You don't need a large planter; many compact flowers flourish in smaller containers, like this IKEA white window box planter.
From petunias to lantana, there's a perfect flower for every climate. Here, a gardening expert shares top picks for window box flowers that will dazzle for months.
1. Petunias
According to our expert, 'Petunias are a fantastic choice for long-lasting window box arrangements.' Modern varieties, particularly trailing types, bloom continuously, cascading beautifully over the container's edges for a lush, full effect.
Petunias thrive in USDA zones 2-8, and they're simple to grow in pots. They're perfect as spillers in thriller, spiller, filler combinations and also do well in a hanging basket (like this coco coir lined one from Amazon).
To keep petunias blooming into fall, Brandon suggests lightly deadheading and feeding them every 2-3 weeks.
Use gardening snips available on Amazon to remove faded blooms.
These pink petunia starter plants from Walmart work wonderfully in window boxes.
2. Verbena
'Verbena is a trailing bloom that thrives in heat, flowering well into late summer and early fall,' our expert notes.
There's a variety of types of verbena to consider. Taller varieties, like 'Argentinian Vervain' reaching 5-7ft, work great for back borders. For window boxes, opt for compact bedding varieties, such as 'Quartz' verbena (available as seeds on Amazon), hardy in USDA zones 7-11.
Position it in full sun and deadhead lightly mid-season to promote growth and a fresh round of blooms.
You can start verbena from seeds; check out these verbena seeds from Burpee, starting them early indoors between late winter and spring.
Bonus: This plant attracts pollinators, so expect bees and butterflies to grace your window box all season long.
3. Lantana
'Lantana shines in warmer climates, offering vibrant flower clusters that draw in pollinators and endure heat and drought,' our expert explains.
It can be grown across USDA zones 8-11 and loves pots with good drainage. It features a spectrum of colors, including the stunning two-tone pink and yellow shown above.
Ensure excellent drainage and full sunlight for optimal growth, as lantana thrives better under slight stress rather than excessive watering.
Remember to prune your lantana using sharp, clean pruning shears (like these from Amazon) for a tidy appearance and to remove any leggy growth.
Find a lantana plant at Burpee.
4. Pelargoniums
'Pelargoniums are excellent for consistent color,' our expert notes. 'They provide structure with their upright growth and tolerate sun and heat, making them a reliable choice for window boxes.'
You can grow pelargoniums across many climates, thriving best in USDA zones 9-11.
Available in an array of colors, from these red pelargoniums on Amazon to these white pelargoniums on Amazon. For delightful fragrance, consider scented pelargoniums (available at Walmart).
Always allow the soil to dry slightly before watering to prevent over-saturation and promote robust flowering.
A soil moisture meter from Amazon can help determine when your planter's soil is adequately dry.
5. Million Bells
'Calibrachoa, or million bells, produces smaller blooms similar to petunias but with even more abundant flowering,' our expert shares.
This flower is perfect for creating a vibrant, cascading effect throughout the season.
Window boxes are ideal for million bells since they require excellent drainage.
Use a quality potting mix (like this Miracle-Gro potting mix from Walmart) and avoid overwatering. These plants thrive best with consistently moist roots, not soggy ones.
Million bells come in a wide range of colors, including this yellow million bells plant on Amazon and this tangerine million bells from Walmart. They thrive in USDA zones 9-11.
Shopping Suggestions
This lovely flower box adds a charming cottage feel to any window or balcony. It's simple to install and comes with hooks.
Designed with a depth marker for accuracy, this stainless steel trowel features a sturdy wooden handle.
This set of 4 red petunia plants is perfect for filling window boxes, hanging baskets, and containers.
