Alaska’s endless summer daylight pushes flowers to grow rapidly, making early-maturing varieties essential for success. When you are searching for the best flowers to grow in alaska summer, you need plants that can handle cool soil and long days. The midnight sun gives you a unique advantage, but it also demands smart choices.
Your Alaskan garden faces a short growing season, often just 90 to 120 days. Some flowers bolt or fail to bloom when daylight stretches past 18 hours. Others thrive, producing vibrant colors that last until the first frost. This guide covers the top performers for your specific conditions.
Understanding Alaska’s Summer Growing Conditions
Alaska summers are intense. You get long daylight hours, sometimes 20 hours or more in the far north. This light boost speeds up photosynthesis, but it also heats up soil quickly during the day and cools it down at night.
Soil temperature matters a lot. Most flowers need soil above 50°F to germinate well. In Alaska, you often start seeds indoors or buy transplants to get a head start. Frost can strike even in June, so you must be ready to protect young plants.
Daylight Hours And Plant Growth
Plants respond to day length. Some are “long-day” plants that bloom only when days are long. Others are “short-day” plants that need shorter nights. In Alaska, long-day flowers like pansies and calendula do great. Short-day flowers like chrysanthemums may struggle unless you time them right.
- Long-day flowers: bloom earlier and more profusely
- Short-day flowers: may delay blooming until late summer
- Day-neutral flowers: bloom regardless of day length
You want to pick flowers that match your local daylight pattern. For most of Alaska, that means long-day or day-neutral varieties are safest.
Frost Dates And Growing Season
Your last spring frost can be as late as early June in some areas. Your first fall frost often arrives in September. That gives you roughly three months of frost-free weather. Some flowers can handle light frost, which extends your season a bit.
Check your local frost dates. In Anchorage, the average last frost is May 15. In Fairbanks, it’s May 20. In Juneau, it’s April 30. Adjust your planting schedule accordingly.
Best Flowers To Grow In Alaska Summer
Now we get to the core list. These flowers have proven themselves in Alaskan gardens. They tolerate cool soil, long days, and short seasons. Many are also deer-resistant, which is a bonus in rural areas.
1. Pansies And Violas
Pansies are cold-hardy champions. They can survive light frost and even snow. You can plant them as soon as the soil is workable in spring. They bloom continuously until heat stress sets in, but in Alaska, that’s rarely an issue.
Violas are smaller but equally tough. They self-seed easily, so you might get volunteers next year. Both come in many colors, from deep purple to bright yellow.
- Plant in full sun to partial shade
- Space 6-8 inches apart
- Deadhead spent blooms for more flowers
- Water regularly, especially during dry spells
2. Calendula (Pot Marigold)
Calendula is a long-day flower that thrives in Alaska. It blooms from early summer until frost. The bright orange and yellow petals are edible and attract pollinators. Calendula also self-sows, so you may get new plants next year.
It grows well in poor soil, but you should add compost for best results. Calendula can handle light frost, making it a reliable choice for your garden.
3. Nasturtiums
Nasturtiums are fast-growing annuals. They bloom within 6-8 weeks from seed. The flowers and leaves are edible, with a peppery taste. They prefer poor soil; too much nitrogen gives you leaves but few flowers.
In Alaska, start seeds indoors 3-4 weeks before the last frost. Or direct sow after soil warms up. They trail nicely in hanging baskets or grow upright in beds.
4. Sweet Peas
Sweet peas love cool weather. They germinate best in soil around 55°F. In Alaska, you can direct sow them as soon as the ground thaws. They climb trellises or fences, adding vertical interest.
Choose early-flowering varieties like “Cupani” or “Old Spice.” These bloom in 60-70 days. Soak seeds overnight before planting to speed germination. Sweet peas need full sun and regular watering.
5. Marigolds
Marigolds are heat-tolerant, but they also do well in Alaska’s cool summers. They bloom from June until frost. French marigolds are compact and bloom early. African marigolds are taller but take longer to flower.
Plant marigolds after the last frost. They repel some pests, making them good companions for vegetables. Deadhead regularly to keep them blooming.
6. Sunflowers
Sunflowers are iconic for Alaska. The long days push them to grow tall quickly. Choose early-maturing varieties like “Sunspot” or “Teddy Bear.” These bloom in 50-60 days.
Direct sow after the last frost. Sunflowers need full sun and well-drained soil. They attract birds and bees. Some varieties reach 10 feet tall, so give them space.
7. Cosmos
Cosmos are easy to grow from seed. They bloom in 60-70 days. The delicate flowers come in pink, white, and purple. Cosmos tolerate poor soil and drought once established.
In Alaska, start seeds indoors 4-6 weeks before the last frost. Or direct sow after soil warms. They self-sow readily, so you might see them again next year.
8. Snapdragons
Snapdragons are cool-season flowers. They bloom best when nights are cool, which Alaska provides. They come in many heights and colors. Dwarf varieties work well in containers.
Plant transplants after the last frost. Snapdragons can handle light frost. Pinch back the tips when they are 6 inches tall to encourage bushier growth.
9. Alyssum
Sweet alyssum is a low-growing ground cover. It blooms all summer with tiny white, pink, or purple flowers. The scent is honey-like and attracts beneficial insects.
Alyssum is frost-tolerant. You can direct sow it early. It self-sows easily, filling in gaps in your garden. Use it as a border or in rock gardens.
10. Lupines
Lupines are native to Alaska. They come in blue, purple, pink, and white. They fix nitrogen in the soil, improving fertility for other plants. Lupines bloom in early to mid-summer.
Direct sow in spring or fall. They need full sun and well-drained soil. Lupines can be short-lived perennials, but they self-seed readily. Watch for slugs, which love young lupine leaves.
Planting Tips For Alaskan Gardens
Success with flowers in Alaska comes down to timing and preparation. Here are key steps to follow.
Start Seeds Indoors
Most flowers need a head start. Begin seeds indoors 6-8 weeks before your last frost date. Use a seed-starting mix and keep them under grow lights or in a sunny window. Harden off seedlings gradually before transplanting.
- Fill trays with moist seed-starting mix
- Sow seeds at the depth recommended on the packet
- Cover with plastic wrap to retain moisture
- Place in a warm spot (65-75°F)
- Remove plastic once seeds germinate
- Provide 14-16 hours of light daily
- Water from the bottom to prevent damping off
Prepare Your Soil
Alaskan soil is often acidic and low in organic matter. Test your soil pH. Most flowers prefer pH 6.0-7.0. Add lime if needed to raise pH. Mix in compost or well-rotted manure to improve drainage and fertility.
Raised beds warm up faster in spring. They also drain better, which helps in rainy areas like Southeast Alaska. Use landscape fabric to suppress weeds and retain heat.
Use Season Extenders
Cold frames, row covers, and cloches protect plants from frost. They also warm the soil. You can start flowers 2-4 weeks earlier with these tools. Remove covers during the day to prevent overheating.
Floating row covers also keep insects away. Use them on young plants to prevent flea beetle damage. Just make sure to remove them when flowers start blooming so pollinators can reach them.
Water Wisely
Alaska summers can be dry, especially in interior regions. Water deeply once or twice a week, rather than shallowly every day. This encourages deep root growth. Mulch with straw or bark to retain moisture and keep soil cool.
In rainy areas like the coast, you may need less watering. Check soil moisture by sticking your finger an inch into the soil. If it feels dry, water.
Common Challenges And Solutions
Even with the best flowers, you may face problems. Here are common issues and how to handle them.
Slugs And Snails
Slugs love Alaska’s cool, damp conditions. They eat holes in leaves and flowers. Handpick them at night or use beer traps. Diatomaceous earth around plants also works. Encourage natural predators like ground beetles.
Flea Beetles
These tiny beetles jump when disturbed. They chew small holes in leaves, especially on seedlings. Use row covers to protect young plants. Neem oil sprays can help. Keep weeds down, as they harbor beetles.
Short Growing Season
If your season is very short, choose the fastest-maturing varieties. Look for “early” or “quick-blooming” labels. You can also use transplants instead of seeds. Some flowers, like pansies, can be planted in fall for early spring blooms.
Wind Damage
Alaska can be windy, especially in open areas. Stake tall flowers like sunflowers and sweet peas. Plant windbreaks using shrubs or fences. Choose compact varieties that are less likely to snap.
Designing Your Alaskan Flower Garden
You want your garden to look good all summer. Plan for continuous color by choosing flowers that bloom at different times.
Early Bloomers (June)
Pansies, violas, and calendula start blooming soon after planting. They provide color while other flowers are still growing. Plant them in front of taller flowers.
Mid-Season Bloomers (July)
Sweet peas, marigolds, and cosmos peak in July. They fill the garden with height and fragrance. Use them as backdrops or in clusters.
Late Bloomers (August-September)
Snapdragons and nasturtiums keep going until frost. Some sunflowers bloom late if you plant them early. Deadhead regularly to extend bloom time.
Color Combinations
Use complementary colors for impact. Purple pansies with yellow calendula create contrast. White alyssum softens bright marigolds. Experiment with different combinations each year.
Frequently Asked Questions
What flowers bloom all summer in Alaska?
Pansies, calendula, marigolds, and nasturtiums bloom continuously from June to September if you deadhead them. Sweet alyssum also flowers all summer long.
Can I grow roses in Alaska?
Yes, but choose hardy varieties like “Parkland” or “Explorer” series. They need full sun and protection from wind. Mulch heavily in winter. Some roses bloom from July to September.
Do I need to fertilize flowers in Alaska?
Yes, but lightly. Use a balanced fertilizer like 10-10-10 once a month. Too much nitrogen gives leaves but few flowers. Compost provides slow-release nutrients.
What is the best time to plant flower seeds in Alaska?
Start seeds indoors 6-8 weeks before the last frost. Direct sow after the soil warms, usually late May or early June. Some flowers like pansies can be planted in fall for spring blooms.
How do I protect flowers from frost in Alaska?
Use row covers, cloches, or cold frames. Water the soil before a frost; wet soil holds heat. Bring containers indoors overnight. Plant in raised beds for better drainage and warmth.
Final Thoughts On Alaskan Flower Gardening
Growing flowers in Alaska is rewarding. The long daylight hours give you vibrant colors and fast growth. By choosing the right varieties and timing your planting, you can enjoy a beautiful garden from June to September.
Start with pansies and calendula for early color. Add sweet peas and sunflowers for height. Use marigolds and cosmos for mid-season blooms. With a little planning, your Alaskan summer garden will be the envy of your neighbors.
Remember to check your local frost dates and soil conditions. Use season extenders to get a head start. And don’t forget to deadhead regularly for continuous blooms. Happy gardening in the Last Frontier.