Growing stevia in Alaska might seem challenging due to the state’s unique climate and short growing season, but with the right techniques and care, you can successfully cultivate this sweet herb. Stevia (Stevia rebaudiana) is a perennial plant known for its natural sweetness, making it an excellent alternative to sugar. Here’s how to grow stevia in Alaska, covering essential aspects from planting to harvesting.
Stevia is native to Paraguay and Brazil, where it thrives in warm, humid conditions. The leaves of the stevia plant contain compounds called steviol glycosides that are up to 300 times sweeter than sugar. Unlike traditional sweeteners, stevia has no calories, making it a popular choice for health-conscious individuals.
Understanding the growing conditions that suit stevia is crucial for success in Alaska:
Temperature: Stevia thrives in temperatures between 60°F and 85°F (15°C to 30°C). It cannot tolerate frost, so it’s essential to manage its exposure to cold weather.
Soil: Well-draining soil enriched with organic matter is vital. Stevia prefers slightly acidic to neutral pH levels (6.0-7.0).
Sunlight: This plant requires full sun for at least 6-8 hours daily. However, too much intense heat can be detrimental, so it’s important to provide some shade during the hottest part of summer.
Watering: Consistent moisture is crucial during the growing season, but overwatering can lead to root rot. The soil should be kept consistently damp but not saturated.
Given Alaska’s short growing season, starting stevia seeds indoors is a practical approach:
Choose high-quality stevia seeds from reputable sources. Look for varieties that are well-suited for cooler climates or heirloom varieties that have been successfully grown in similar conditions.
Timing: Start seeds indoors about 8-10 weeks before the last expected frost date in your area.
Containers: Use seed trays or small pots filled with seed-starting mix that drains well.
Sowing Seeds: Sow seeds on the surface of the soil and lightly press them in. They need light for germination, so avoid covering them too deeply.
Humidity and Warmth: Cover the trays with a humidity dome or plastic wrap to retain moisture until germination occurs. Keep them in a warm area (around 70°F/21°C).
Watering: Mist the soil gently to keep it moist but not waterlogged.
Light Exposure: Once germinated (which can take 7-14 days), provide plenty of light using grow lights or place them near a south-facing window.
Once seedlings develop their second set of true leaves and outdoor temperatures remain consistently above 60°F (15°C), they are ready for transplanting:
Hardening Off: Gradually acclimate your seedlings by exposing them to outdoor conditions for a week or two before planting outside.
Site Preparation: Choose a sunny spot in your garden with well-drained soil. Amend the soil with compost or organic matter if necessary.
Spacing: Space seedlings 18-24 inches apart to allow adequate airflow and growth.
Once your seedlings are hardened off and outdoor conditions are suitable, you can plant them in your garden:
Digging Holes: Make holes deep enough to accommodate the roots without bending them.
Planting: Place each seedling gently into the hole and cover with soil, ensuring that the crown is level with the ground surface.
Watering Post-Planting: Water thoroughly after planting to help settle the soil around the roots.
Maintaining healthy stevia plants is essential:
Watering Schedule: Water regularly; ensure that soil remains moist but not soggy.
Mulching: Apply mulch around plants to conserve moisture and suppress weeds.
Fertilizing: Use an organic fertilizer once a month during the growing season to support robust growth.
Pest Management: Keep an eye out for pests like aphids or spider mites; use natural pesticides or insecticidal soap if needed.
Harvesting stevia at the right time ensures maximum sweetness:
The best time to harvest stevia leaves is just before flowering when they reach peak sweetness:
Seasonal Harvests: In Alaska, late summer (August) is generally when plants will be ready for harvest.
Leaf Selection: Select healthy leaves from the top of the plant as they contain the most sweetness.
Cutting Stems: Use sharp scissors or pruning shears to cut stems about one inch above where new growth emerges.
Leave Some Growth: Leave some leaves on each stem so that plants can continue growing throughout late summer and early fall.
After harvesting, proper drying will preserve flavor and sweetness:
Air Drying: Bundle stems together and hang them upside down in a dark, dry place with good air circulation.
Dehydrator Method: Alternatively, use a dehydrator set at low temperatures (95°F/35°C) until leaves are crisp.
Store dried leaves in airtight containers away from light until ready for use:
Crushing Leaves: Crush dried leaves for easier use as a sweetener.
Making Extracts: You can also make liquid extracts by steeping crushed leaves in alcohol or glycerin.
Growing stevia in Alaska can be rewarding but comes with its own set of challenges:
With a growing season typically lasting from May through September (with many areas experiencing frost until mid-June), maximizing every moment of warmth is crucial.
While pests are often fewer in cooler climates, when they do appear, they can become a problem quickly due to limited natural predators that thrive in colder environments.
Even early falls can bring unexpected frosts; utilizing row covers or cold frames can help protect tender plants from sudden temperature drops.
Growing stevia in Alaska may require some extra effort due to climate challenges, but with careful planning and management, it can be a fruitful endeavor. By starting seeds indoors, choosing appropriate growing methods, and maintaining your plants actively throughout their lifecycle, you’ll not only enjoy fresh stevia leaves but also embrace a sustainable way of sweetening your foods naturally! Whether used fresh or dried as a sweetener alternative, homegrown stevia provides health benefits while allowing you to enjoy gardening even within Alaska’s unique environment.