Susan Lily Flower Growing Guide: Pacific Northwest's Year-Round Hummingbird Haven

Growing Susan lily flowers (Hemerocallis fulva) in the Pacific Northwest means year-round hummingbird feasts and bold orange blooms that never quit. 🌸 I’ve watched these hardy perennials bounce back from snow to summer with minimal fuss—once established, they’re practically indestructible.

The secret lies in their love for rich, well-draining soil and six-plus hours of sunlight, even in our famously damp climate.

You’ll need just three things to get started: a sunny spot (partial shade works too), a fork for dividing clumps, and patience—these beauties spread fast. Plant in early spring or fall, water deeply once a week, and watch them reward you with blooms from June through frost.

They thrive in zones 3-9, making them the PNW’s unsung hero for pollinators.

By midsummer, your garden will hum with activity as hummingbirds dart between the flowers, and the scent of honeyed blooms will linger in the air. These lilies even handle pests like deer and rabbits better than most perennials, though slugs might take a nibble now and then.

Their grass-like foliage stays lush year-round, adding texture to borders or meadow-style plantings.

Want to multiply your stash? Divide clumps every 3-4 years in early spring—they’ll thank you with even bigger blooms. Pair them with coneflowers or bee balm for a hummingbird superhighway, and you’ve got a low-maintenance, high-reward garden staple. Ready to grow your own haven?

What you need

Step-by-step instructions for growing Susan lily flowers

Here's how to cultivate these vibrant blooms that will keep hummingbirds visiting all year.

Susan lilies thrive in partial shade, making them ideal for the Pacific Northwest's dappled light conditions. Select a spot that receives 4-6 hours of morning sun and afternoon shade—this prevents scorching while ensuring enough energy for blooming. I always test the site by observing how sunlight moves across the area throughout the day; you'll want to avoid spots where hot afternoon rays linger.

These flowers appreciate consistent moisture but hate soggy roots, so avoid low-lying areas where water pools. If your garden has heavy clay soil, amend it with 2-3 inches of compost before planting to improve drainage. The ideal spot will have soil that feels slightly damp but not waterlogged when you squeeze it.

Susan lilies grow from tubers, which should be planted in early spring after the last frost when soil temperatures reach 60°F. Loosen the soil to a depth of 12 inches and mix in 1 cup of bone meal per planting hole to provide phosphorus for strong root development. The tubers have a pointed end—plant this side up at a depth of 4-6 inches, spacing them 12-18 inches apart for mature plants.

Cover the tubers with soil and water thoroughly until moisture reaches 6 inches deep. You'll notice the soil surface settle slightly—this is normal. Mulch with 2-3 inches of shredded bark to retain moisture and regulate soil temperature. This mulch layer also helps suppress weeds that compete for nutrients.

Keep the soil evenly moist but never soggy during the growing season. Water deeply 2-3 times per week, providing 1 inch of water each time until the tubers establish strong roots. You'll know you're doing it right when the soil feels damp 2 inches below the surface—stick your finger in to check. Once established, Susan lilies become drought-tolerant, but consistent moisture encourages larger, more vibrant blooms.

Apply a balanced 10-10-10 fertilizer every 4-6 weeks during the growing season, following package instructions. I like to fertilize after the first flush of blooms appears—this gives the plant energy for a second round of flowers. Stop fertilizing in late summer to allow tubers to store energy for next year's growth.

As flowers fade, deadhead them by snipping spent blooms just above the first set of healthy leaves. This encourages the plant to produce more flowers and prevents seed formation, which can drain the plant's energy. I always use clean, sharp scissors to avoid damaging the stems. Deadheading also keeps the foliage looking tidy and extends the blooming season.

In late fall, after the first frost blackens the foliage, cut back the stems to 2 inches above the ground. This prevents disease and makes it easier to spot new growth in spring. The tubers will remain dormant underground, so no additional winter care is needed. In the Pacific Northwest's mild climate, Susan lilies often resprout early, so you might see new growth as early as February.

Susan lilies form dense clumps over time, so dividing them every 3-4 years keeps them healthy and prevents overcrowding. The best time to divide is in early spring before new growth appears. Dig up the entire clump and gently separate the tubers with your hands or a clean knife. Each division should have at least one healthy bud and a portion of the root system.

Replant the divisions immediately in the prepared soil, spacing them as you did initially. Water thoroughly after planting to help them establish. This is also a great time to share plants with fellow gardeners—every division you replant means more vibrant blooms and happy hummingbirds next season.

Tips & tricks for perfect Susan lily flower growth

These insights will help you cultivate thriving Susan lilies that bring hummingbirds to your Pacific Northwest garden all year.

Lighting Secret: The 4-6 hours of morning sun is crucial—it's the perfect balance for our region. I've found that placing them near a north-facing window or under the dappled shade of a deciduous tree creates ideal conditions. Watch for leaf scorch if they get more than 6 hours of direct sun, especially in summer afternoons.

Soil Prep Strategy: For heavy clay soil, I recommend mixing in 2-3 inches of compost AND adding a handful of perlite to improve drainage. This combination prevents waterlogging while still providing nutrients. The soil should crumble easily when dry—if it forms hard clumps, you need more organic matter.

Planting Depth Tip: When planting tubers at 4-6 inches deep, make sure the pointed end faces upward—this is where new shoots emerge. I always mark planting spots with small flags to remember where I've planted, especially in larger gardens where spacing 12-18 inches apart can get confusing.

Watering Wisdom: The 2-3 times per week watering schedule works best when you water deeply—aim for that 1 inch measurement. I use a rain gauge to track moisture, and always water in the morning so foliage has time to dry before evening. This prevents fungal issues that can plague these tropical-looking plants in our cooler climate.

Frequently asked questions

What’s the best time to plant Susan Lily bulbs in the PNW?

Plant them in early fall (September–October), about 6–8 weeks before the first frost. This gives roots time to establish before winter. If you miss the fall window, you can plant in late winter (February–March), but growth may be slower until spring.

Will Susan Lilies attract hummingbirds year-round in the PNW?

Yes! Their bright orange-red blooms and nectar-rich flowers are a hummingbird magnet from late spring to early fall (May–September). While they’re not evergreen, their long bloom season and late-summer reblooms keep feeders coming back. Pair them with Penstemon or Salvia for extended support.

Why aren’t my Susan Lilies blooming?

Common culprits include:

• Too much shade: They need full sun (6+ hours/day) for robust blooms.
• Overcrowded bulbs: Divide clumps every 3–4 years to prevent competition.
• Poor drainage: These bulbs rot in soggy soil—amend with compost or plant on a slope.
• Young plants: Give them 2–3 years to mature before expecting flowers.

How do Susan Lilies handle PNW’s wet winters?

They’re tolerant of rain and mild winters (USDA Zones 5–8), but avoid soggy soil—plant on a mound or in raised beds. Mulch with 3–4 inches of bark or straw in winter to insulate bulbs. If your area gets freezing temps below 10°F (-12°C), add extra mulch or cover with burlap.

Can I grow Susan Lilies in containers?

Yes! Use a large pot (12"+ diameter) with fast-draining mix (50% potting soil, 30% perlite, 20% compost). Plant 3–5 bulbs per container and place in full sun. Containers dry out faster, so water deeply 1–2x/week in summer. Warning: Bulbs may need winter protection in cold zones—move pots to a garage or insulate with bubble wrap.

What pests should I watch for with Susan Lilies?

Keep an eye out for:

• Squash vine borers: Lay floating row covers early in the season.
• Aphids: Blast off with a water spray or use neem oil.
• Slugs/snails: Set out beer traps or use copper barriers.
• Rodents: Plant bulbs 6"+ deep or use bulb cages in high-mice areas.