Best Time To Plant Lemon Grass In Oregon

Oregon’s maritime influence creates unique planting windows that differ dramatically between the western valleys and eastern high desert regions. Knowing the best time to plant lemon grass in oregon is essential for a thriving harvest, whether you’re in Portland or Pendleton.

Lemon grass is a tropical plant, so it hates frost. Oregon’s climate ranges from mild, wet winters to hot, dry summers. This means your planting schedule depends heavily on where you live in the state.

Let’s break down exactly when to get this fragrant herb into the ground. We’ll cover soil temps, frost dates, and even container growing tips.

The simple answer is: late spring to early summer. More specifically, aim for two to three weeks after your last expected frost date. For most of western Oregon, that’s mid-May. For eastern Oregon, it’s late May or even early June.

Lemon grass needs warm soil to grow well. Soil temperature should be at least 60°F (15°C) at planting depth. Cold soil will stunt growth or cause root rot.

Here’s a quick breakdown by region:

Western Valleys (Portland, Salem, Eugene): Plant from mid-May to early June.
Coastal Areas (Astoria, Newport): Plant from late May to mid-June. Cooler summers mean slower growth.
Eastern Oregon (Bend, Pendleton, Medford): Plant from late May to early June. Watch for late frosts.
High Desert (Burns, Lakeview): Plant from early June. Nights stay cold even in summer.

Why Timing Matters So Much

Lemon grass is not frost tolerant. A single light frost can kill the plant. Oregon’s spring weather is unpredictable. A warm spell in April can be followed by a hard freeze in May.

Planting too early risks losing your plants. Planting too late means a shorter growing season. You want at least 100 frost-free days for a good harvest.

Check your local frost dates. The Old Farmer’s Almanac website has a tool for your zip code. Use that as your starting point.

Soil Temperature Is Your Real Guide

Air temperature is not enough. Lemon grass roots need warmth. Use a soil thermometer. Insert it four inches deep in the morning.

Wait until the soil reads 60°F or higher. If it’s below 55°F, hold off. Cold soil slows root development and invites disease.

You can warm soil faster by covering it with black plastic a week before planting. This is helpful in cooler regions like the coast.

Preparing Your Garden For Lemon Grass

Lemon grass grows best in full sun. It needs at least six hours of direct sunlight daily. In Oregon’s cloudy areas, choose the sunniest spot you have.

Soil should be rich and well-draining. Heavy clay soil is common in the Willamette Valley. Amend it with compost or aged manure. Raised beds work great for drainage.

Here’s how to prepare:

Choose a sunny, sheltered location. Avoid low spots where frost settles.
Remove weeds and grass. Lemon grass does not compete well.
Dig in 2-3 inches of compost. This adds nutrients and improves drainage.
If soil is heavy clay, add sand or perlite. Or use a raised bed.
Test soil pH. Aim for 6.0 to 7.5. Most Oregon soils are fine.

Container Growing Options

Many Oregon gardeners grow lemon grass in pots. This gives you control over soil and location. You can move the pot indoors when frost threatens.

Use a large pot, at least 12 inches deep and wide. Lemon grass has a big root system. Make sure the pot has drainage holes.

Use a quality potting mix. Add slow-release fertilizer. Place the pot in full sun. Water regularly, but don’t let it sit in water.

Container plants dry out faster. In Oregon’s summer heat, you may need to water daily. Mulch the top of the pot to retain moisture.

Planting Step-By-Step

You can start lemon grass from seed, but it’s slow. Most gardeners buy starter plants or use stalks from the grocery store.

Here’s how to plant lemon grass in Oregon:

Wait until soil is 60°F and all frost danger has passed.
Dig a hole twice as wide as the root ball. Same depth as the pot.
Place the plant in the hole. Backfill with soil. Firm gently.
Space plants 24-36 inches apart. They spread out.
Water deeply after planting. Keep soil moist for the first week.
Apply a 2-inch layer of mulch. This keeps soil warm and moist.

Starting From Grocery Store Stalks

This is a popular method. Buy fresh lemon grass stalks from the store. Look for firm, green stalks with the base intact.

Place the stalks in a glass of water. Change the water every few days. Roots will appear in 1-2 weeks. Plant them outside after frost danger passes.

This method works best in late spring. You can start them indoors in April. Then transplant in May or June.

Caring For Lemon Grass Through Oregon’s Seasons

Once planted, lemon grass needs consistent care. Oregon’s summer heat is good for growth. But the dry season means regular watering.

Water deeply once or twice a week. More often if it’s hot or windy. Less often if you have clay soil. Check soil moisture with your finger.

Fertilize every 4-6 weeks. Use a balanced fertilizer like 10-10-10. Or use fish emulsion for organic growth. Lemon grass is a heavy feeder.

Watch for pests. Aphids and spider mites can appear. Hose them off with water. In Oregon’s wet fall, watch for fungal diseases. Good air circulation helps.

Harvesting Tips

You can start harvesting when stalks are about 12 inches tall. Cut stalks at the base with a sharp knife. Leave the main clump to keep growing.

Harvest regularly to encourage new growth. The best flavor comes from mature stalks. Use fresh or freeze for later.

In Oregon’s short growing season, you may only get one or two harvests. That’s fine. Even a few stalks are worth it.

Overwintering Lemon Grass In Oregon

Lemon grass is a perennial in warm climates. In Oregon, it will not survive winter outdoors. You must bring it inside or protect it.

Here are your options:

Bring pots indoors: Move pots to a sunny window before first frost. Water sparingly through winter.
Dig up and store: Cut back stalks to 6 inches. Dig up the root ball. Store in a cool, dark place like a basement. Keep roots slightly moist.
Take cuttings: Root some stalks in water indoors. Plant them next spring.

In mild coastal areas, you might try mulching heavily. Cover the base with 6-8 inches of straw. This works only in zones 8b or warmer. Most of Oregon is zone 7 or colder.

Common Mistakes To Avoid

Many Oregon gardeners make these errors. Avoid them for better success.

Planting too early. Wait for warm soil.
Overwatering in cool weather. Lemon grass likes moisture, not soggy roots.
Underwatering in summer. Oregon’s dry season can stress plants.
Ignoring frost warnings. Cover plants or bring them in.
Planting in shade. Lemon grass needs full sun.

Regional Variations Across Oregon

Oregon is not one climate. Your best planting time varies by location. Let’s look at specifics.

Willamette Valley

This is the most populous region. Portland, Salem, Eugene. Winters are mild and wet. Summers are warm and dry.

Plant from mid-May to early June. Soil warms up by late May. You may get a long growing season until October. Use black plastic to warm soil faster.

Coastal Areas

Astoria, Newport, Coos Bay. Cool, foggy summers. Mild winters. Soil warms slowly.

Plant from late May to mid-June. Choose a sunny, sheltered spot. Consider using a cold frame or cloche. Growth will be slower than inland.

Southern Oregon

Medford, Ashland, Grants Pass. Hot, dry summers. Cold winters. A longer growing season than the coast.

Plant from mid-May. Soil warms quickly. You may get a good harvest by August. Watch for late spring frosts in higher elevations.

Eastern Oregon

Bend, Pendleton, La Grande. High desert climate. Cold winters, hot summers. Short growing season.

Plant from late May to early June. Use raised beds for warmer soil. Consider growing in containers so you can move them indoors. Frost can occur even in June.

High Desert

Burns, Lakeview, Klamath Falls. Very cold winters. Short, hot summers. Unpredictable frosts.

Plant from early June. Use every trick to warm soil. Black plastic, cloches, or cold frames. Grow in pots for easy relocation. Expect a shorter harvest period.

Frequently Asked Questions

Can I plant lemon grass in Oregon in the fall?

No. Fall planting is not recommended. Lemon grass needs warm soil and a long growing season. Fall planting will not establish before winter. Wait until spring.

What is the latest I can plant lemon grass in Oregon?

You can plant as late as early July. But the harvest will be smaller. In western Oregon, you might get some growth. In eastern Oregon, it’s risky. Earlier is always better.

Should I start lemon grass indoors in Oregon?

Yes, starting indoors gives you a head start. Plant seeds or stalks in pots 6-8 weeks before your last frost. Use a heat mat for best germination. Transplant after soil warms.

How do I protect lemon grass from Oregon frost?

Cover plants with frost cloth or old blankets. Use stakes to keep fabric off leaves. Water the soil before a frost. Wet soil holds heat better. Bring containers indoors.

Can lemon grass survive winter in Oregon if mulched?

Only in the mildest coastal areas (zone 8b or warmer). Most of Oregon is too cold. Mulching may protect the roots, but the plant will likely die. It’s safer to bring it inside.

Final Tips For Success

Lemon grass is a rewarding plant for Oregon gardeners. It adds a tropical feel to your garden. The flavor is amazing in teas, soups, and stir-fries.

Remember these key points:

Wait for soil to reach 60°F.
Plant after last frost date.
Choose a sunny, sheltered spot.
Water regularly in summer.
Bring plants indoors for winter.

With proper timing, you can enjoy fresh lemon grass from your Oregon garden. The best time to plant lemon grass in oregon is late spring to early summer. Adjust for your specific region. Check local frost dates. Use a soil thermometer.

Don’t be afraid to try container growing. It gives you flexibility. You can move plants to catch sun or avoid frost. Many Oregon gardeners find this the easiest method.

Lemon grass is not a fussy plant. Give it warmth, sun, and water. It will reward you with vigorous growth. Even in Oregon’s challenging climate, you can succeed.

Start planning now. Mark your calendar for mid-May. Prepare your soil. Get your pots ready. With a little effort, you’ll have lemon grass all summer long.

Happy planting in your Oregon garden. The fragrance and flavor are worth the wait.