when to plant potatoes seattle

When to Plant Potatoes in Seattle: A Guide for Pacific Northwest Gardeners

Planting potatoes in Seattle requires timing your efforts carefully to avoid late frosts and ensure a successful harvest. Generally, the best time to plant potatoes in Seattle is from mid-March to late April. This aligns with the period after the last expected frost and when the soil has warmed enough for optimal growth.

Potatoes are a popular crop for home gardeners in the Pacific Northwest, and with a little planning, you can enjoy a bountiful harvest of homegrown spuds.

Ideal Planting Time in Seattle

Seattle’s climate is characterized by mild, wet winters and warm, dry summers. Because potatoes need consistent moisture early in their growth cycle, planting after the last frost but before the driest part of summer is crucial. Aim to plant from mid-March to late April. Soil temperatures should be at least 45°F (7°C) for successful germination. You can check soil temperature with a soil thermometer available at most garden stores.

Preparing Your Potato Planting Area

Before planting, prepare the soil by amending it with compost or well-rotted manure. Potatoes thrive in well-drained, slightly acidic soil. Choose a sunny location in your garden that receives at least six hours of sunlight per day. Till the soil to a depth of 12 inches and create rows or hills for planting.

Choosing Seed Potatoes

Select certified seed potatoes from a reputable source. Avoid using potatoes from the grocery store, as they may be treated to prevent sprouting. Seed potatoes are available in various sizes and varieties. Cut larger seed potatoes into pieces, ensuring each piece has at least one or two “eyes” or sprouts. Allow the cut pieces to cure for a few days before planting to prevent rotting.

Planting Your Seed Potatoes

Plant seed potato pieces about 4 inches deep and 12 inches apart in rows that are 2-3 feet apart. The “eyes” should be facing upwards. As the potato plants grow, hill the soil around the stems to encourage more potato formation. This process, called “hilling,” helps to keep the developing tubers covered and protected from sunlight.

Caring for Your Potato Plants

Water your potato plants regularly, especially during dry periods. Fertilize them with a balanced fertilizer formulated for vegetables. Monitor for pests and diseases, such as potato beetles and blight. Take appropriate measures to control any problems that arise. You can learn more about potato pests and diseases on Wikipedia’s Potato Diseases page.

Harvesting Your Potatoes

Harvest early potatoes (also called “new potatoes”) about 60-80 days after planting. These potatoes have thin skins and a delicate flavor. For mature potatoes, wait until the plants have flowered and the foliage begins to die back. This usually occurs about 90-120 days after planting. Carefully dig up the potatoes, being careful not to damage them. Store them in a cool, dark, and dry place.

Frequently Asked Questions

What happens if I plant potatoes too early in Seattle?

Planting too early increases the risk of frost damage, which can kill the plants or significantly reduce yields.

How do I know when my potatoes are ready to harvest?

Early potatoes can be harvested when the plants flower. Mature potatoes are ready when the foliage starts to die back.

Can I grow potatoes in containers in Seattle?

Yes, potatoes can be successfully grown in large containers. Use a well-draining potting mix and ensure the container has drainage holes.

What type of soil is best for growing potatoes in Seattle?

Potatoes prefer well-drained, slightly acidic soil. Amend heavy clay soils with compost to improve drainage.

How much sun do potatoes need in Seattle?

Potatoes need at least six hours of sunlight per day for optimal growth and tuber development.

Summary

Successfully growing potatoes in Seattle involves planting seed potatoes in well-prepared soil from mid-March to late April. Adequate sunlight, regular watering, and hilling are essential for a bountiful harvest. By following these guidelines, you can enjoy fresh, homegrown potatoes from your garden.