Best Time To Plant Artichokes In Washington

Washington’s cool, maritime climate is surprisingly friendly to artichokes, with spring planting timed just after the soil warms. Knowing the best time to plant artichokes in washington is the key to a bumper crop of these delicious, thistle-like buds. Get the timing right, and you’ll be harvesting homegrown artichokes from your own Pacific Northwest garden.

Artichokes are perennials in many climates, but in Washington, they are often grown as annuals or overwintered with protection. The state’s mild summers and cool springs create ideal conditions for artichokes to develop large, tender buds. However, they are sensitive to frost, so planting at the right moment is critical.

This guide will walk you through the exact timing, step-by-step planting instructions, and tips for success. Whether you live west of the Cascades or in the drier eastern part of the state, you’ll find the information you need.

The best time to plant artichokes in washington is in early spring, typically from mid-March to late April, depending on your specific location. The soil temperature should be consistently above 50°F (10°C). Planting too early risks frost damage, while planting too late means the artichokes may not have enough time to mature before the first fall frost.

For western Washington, including Seattle, Tacoma, and Olympia, aim for late March to mid-April. The coastal influence keeps temperatures moderate. For eastern Washington, like Spokane and the Columbia Basin, wait until late April or even early May. The inland climate has colder winters and later springs.

If you are starting artichokes from seed indoors, begin 8 to 10 weeks before your planned outdoor planting date. This gives the seedlings a strong start. Transplant them outdoors after the last frost date has passed and the soil has warmed.

Understanding Washington’s Climate Zones

Washington is divided into distinct climate zones. Western Washington has a marine west coast climate with mild, wet winters and cool, dry summers. Eastern Washington is more continental, with colder winters and hotter, drier summers. This difference affects planting times.

Western Washington (Zone 8a-8b): Last frost date typically around late March to early April. Soil warms up faster near the coast.
Eastern Washington (Zone 6a-7b): Last frost date can be as late as mid-May. Soil warms slower, so wait longer.
Puget Sound Region: Similar to western Washington but with more variation. Check your local frost dates.

Always check your local frost dates using an online tool or your county extension office. This is more accurate than general guidelines. Artichokes are frost-tender, so even a light frost can kill young plants.

Soil Preparation For Artichokes

Artichokes need rich, well-draining soil with a pH between 6.0 and 7.0. They are heavy feeders, so prepare your garden bed in advance. Start amending the soil about two weeks before planting.

Choose a sunny location with at least 6-8 hours of direct sunlight daily.
Loosen the soil to a depth of 12-18 inches.
Mix in 2-4 inches of well-rotted compost or aged manure.
Add a balanced organic fertilizer, such as 10-10-10, according to package directions.
Ensure the soil drains well. Artichokes dislike wet feet.

If your soil is heavy clay, consider raised beds. This improves drainage and warms the soil faster in spring. Artichokes also grow well in large containers, at least 5 gallons in size.

Starting Artichokes From Seed

Starting artichokes from seed gives you more variety options. However, it requires patience. Seeds need a period of cold stratification to germinate well. Here’s how to do it.

Place seeds in a damp paper towel inside a plastic bag.
Refrigerate for 2-4 weeks before planting.
Sow seeds indoors 8-10 weeks before your last frost date.
Plant seeds 1/4 inch deep in seed-starting mix.
Keep the soil moist and warm (70-75°F).
Seeds germinate in 10-14 days.

Once seedlings have two sets of true leaves, transplant them into larger pots. Harden them off gradually over a week before moving them outdoors. This reduces transplant shock.

Transplanting Artichokes Outdoors

When the soil temperature reaches 50°F and all frost danger has passed, it’s time to transplant. Space plants 3-4 feet apart, as they grow large. Dig a hole slightly larger than the root ball.

Water the seedlings thoroughly before transplanting.
Place the plant in the hole at the same depth it was in the pot.
Backfill with soil and gently firm it around the roots.
Water deeply after planting.
Add a layer of mulch to retain moisture and suppress weeds.

If you are planting multiple artichokes, give them plenty of room. They can reach 4-5 feet tall and wide. Proper spacing improves air circulation and reduces disease risk.

Direct Sowing Artichoke Seeds

Direct sowing artichoke seeds in Washington is riskier but possible in warmer microclimates. Wait until the soil is consistently warm, usually late May or early June. Plant seeds 1/2 inch deep and 2-3 feet apart.

Thin seedlings to the strongest one per spot once they are 4-6 inches tall. Direct-sown artichokes may not produce buds until the following year. For a first-year harvest, use transplants.

Caring For Artichokes Through The Season

Artichokes need consistent moisture, especially during bud formation. Water deeply once or twice a week, providing about 1-2 inches of water per week. Drip irrigation is ideal to keep foliage dry.

Fertilize every 4-6 weeks with a balanced fertilizer.
Side-dress with compost in mid-summer.
Remove weeds regularly to reduce competition.
Monitor for pests like aphids and slugs.

Artichokes produce buds on tall stalks. Harvest them when they are tight and firm, about 3-4 inches in diameter. Cut the stalk 2-3 inches below the bud. Smaller side buds will develop later.

Overwintering Artichokes In Washington

In milder parts of western Washington, artichokes can survive winter with protection. Cut back the foliage after the first frost. Cover the crown with a thick layer of mulch, straw, or leaves. Use a frost blanket for extra protection.

In eastern Washington, it’s best to grow artichokes as annuals. Dig up the roots in fall and store them in a cool, dark place. Replant them in spring. This method works well for varieties like ‘Green Globe’.

If you have a greenhouse or cold frame, you can overwinter potted artichokes indoors. Keep them in a cool, bright location and water sparingly.

Common Problems And Solutions

Artichokes are generally hardy, but they can face issues. Here are some common problems and how to fix them.

Bolting: Artichokes may bolt (flower prematurely) if stressed by heat or drought. Keep soil consistently moist and provide afternoon shade in hot areas.
Frost Damage: Protect young plants with row covers if a late frost is forecast. Use cloches or old milk jugs for individual plants.
Pests: Aphids and slugs are common. Use insecticidal soap for aphids and beer traps or diatomaceous earth for slugs.
Poor Bud Development: This is often due to insufficient water or nutrients. Increase watering and fertilize regularly.

If your artichokes don’t produce buds the first year, don’t worry. They may need a cold period to initiate flowering. In Washington, this often happens naturally over winter.

Best Artichoke Varieties For Washington

Choose varieties that mature quickly and tolerate cooler temperatures. Here are some top picks for Washington gardeners.

‘Green Globe’: Classic variety, reliable, produces large buds. Good for annual or perennial culture.
‘Imperial Star’: Bred for annual production, matures in 85-100 days. Ideal for short seasons.
‘Violetto’: Italian heirloom with purple buds. Tolerates cooler weather well.
‘Tavor’: Hybrid variety, high yields, disease resistant. Good for beginners.

All these varieties perform well in Washington’s climate. ‘Imperial Star’ is especially recommended for eastern Washington due to its faster maturity.

Harvesting Artichokes

Harvest artichokes when the buds are still tight and the scales are firm. The bud should be about 3-4 inches in diameter. If the scales start to open, the artichoke is overmature and tough.

Use a sharp knife to cut the stem 2-3 inches below the bud.
Harvest in the morning when buds are cool and crisp.
Check plants every few days during peak season.
Secondary buds will develop on side shoots after the main bud is harvested.

Artichokes can be stored in the refrigerator for up to two weeks. Keep them in a plastic bag with a damp paper towel. They also freeze well after blanching.

Extending The Growing Season

To get the most from your artichokes, consider using season-extending techniques. Row covers can protect plants from early frosts and warm the soil faster. Cold frames or hoop houses can add weeks to your growing season.

In western Washington, you can plant artichokes in fall for a spring harvest the following year. This works best with established plants that have been overwintered. The mild winters allow them to survive and produce early buds.

For eastern Washington, use black plastic mulch to warm the soil in spring. This helps artichokes get a faster start. Also, choose the earliest-maturing varieties to beat the first fall frost.

Frequently Asked Questions

What is the best month to plant artichokes in Washington?

The best month is typically April for western Washington and May for eastern Washington. Always check your local frost dates for precision.

Can I plant artichokes in the fall in Washington?

Yes, in mild areas of western Washington, you can plant in fall for a spring harvest. Use established plants and provide winter protection.

How long does it take for artichokes to grow in Washington?

From transplant, artichokes take about 85-100 days to produce buds. From seed, expect 120-150 days. ‘Imperial Star’ is faster.

Do artichokes need full sun in Washington?

Yes, they need at least 6-8 hours of direct sunlight daily. In hotter parts of eastern Washington, some afternoon shade can be beneficial.

Can I grow artichokes in containers in Washington?

Yes, use large containers (at least 5 gallons) with good drainage. Place them in a sunny spot and water regularly. Overwinter containers indoors in cold areas.

Final Tips For Success

Planting artichokes at the right time is just the beginning. Here are a few more tips to ensure a great harvest.

Start with healthy transplants from a nursery or your own seedlings.
Water consistently, especially during dry spells.
Mulch heavily to keep soil cool and moist.
Harvest buds promptly to encourage more production.
Protect plants from frost with covers or mulch.

Artichokes are a rewarding crop for Washington gardeners. With the right timing and care, you can enjoy fresh, homegrown artichokes that taste far better than store-bought ones. The key is to plant at the best time to plant artichokes in washington and give them the conditions they need to thrive.

Remember, gardening is a learning process. Even if your first attempt isn’t perfect, you’ll gain experience for next year. Artichokes are forgiving plants, and Washington’s climate is on your side. Happy planting.