Aster and Morning Glory Flowers: Year-Round Climbing Color Combo

Aster and morning glory flowers create a year-round climbing color show that outshines any single-season display. 🌼 I fell for this combo after my first attempt—purple morning glories spiraling up a trellis while late-summer asters burst into pink and blue below.

The contrast in height and bloom time turns a simple fence into a living tapestry.

The magic happens when you pair morning glories' vining enthusiasm with asters' bold late-season flair. Morning glories climb 8–10 feet, while asters stay compact at 1–3 feet, creating natural layers.

Plant morning glories along trellises or arbors, then tuck asters at their base or in front for a foolproof vertical garden that thrives from spring to frost.

You'll end up with a garden that feels alive in every season—spring's morning glory blooms, summer's lush foliage, and fall's aster explosions. The combination also repels pests naturally, with morning glories deterring aphids while asters attract pollinators.

Plus, the textural contrast between glossy morning glory leaves and fuzzy aster blooms adds depth any gardener will notice.

Works in cottage gardens, modern borders, or even container setups with dwarf varieties. The key is spacing morning glories 6–8 inches apart along supports while giving asters 12–18 inches of breathing room. Here's how to make it work beautifully in your space.

What you need

How to plant and grow asters and morning glories together

Here's how to create a stunning vertical garden with these two favorites—astilbes for lush foliage and morning glories for dramatic blooms.

Morning glories thrive in full sun, while asters prefer partial shade—so position your trellis or fence where morning glories get at least 6 hours of sunlight and asters receive 4-6 hours of morning sun. I always test the spot first by watching how light moves across it throughout the day.

Before planting, loosen the soil to a depth of 12 inches with a garden fork. Mix in 2-3 inches of compost to improve drainage and fertility. Asters and morning glories both appreciate well-draining soil, so avoid heavy clay. If your soil is compacted, add sand or perlite to help roots spread easily.

Sow morning glory seeds directly into the ground after the last frost date, when soil temperatures reach at least 60°F. Plant seeds ½ inch deep, spacing them 6-8 inches apart along the base of your trellis or fence. I like to plant them in a slight trench to keep seeds moist while they germinate.

Water gently but thoroughly after planting to settle the soil around the seeds. Morning glories germinate quickly—usually within 7-14 days—so keep the soil consistently moist until they sprout. Once seedlings appear, thin them to the strongest 3-4 plants per trellis to give them room to climb.

Plant aster starts 2-3 weeks after your morning glories sprout, when the soil has warmed further. Dig holes twice as wide as the root ball and place each plant so the top of the root ball sits just below soil level. Space asters 12-18 inches apart to allow for their bushy growth.

Water deeply after planting to help roots establish. Asters bloom in late summer and fall, providing color long after morning glories fade. I often mix New England asters (tall and showy) with Chinese asters (compact and colorful) for variety. Mulch around the base with 2-3 inches of shredded bark to retain moisture and suppress weeds.

As morning glories grow, gently guide their vines onto the trellis, tying them with soft twine or plant clips every 12-18 inches. Don’t pull the vines—just coax them upward to encourage strong climbing. Water both plants 1-2 inches per week, focusing on the base rather than overhead watering to prevent fungal diseases.

Fertilize lightly every 4-6 weeks with a balanced 10-10-10 formula, but avoid overfeeding—morning glories are fast growers and can become leggy if overfertilized. Deadhead spent morning glory blooms to encourage more flowers, and trim aster stems back by ⅓ after their first flush of blooms to promote a second round of flowers.

In fall, cut back aster stems to 6 inches tall and mulch heavily to protect roots from freezing temperatures. Morning glories die back naturally, but you can leave the trellis in place—many varieties self-seed, so you’ll likely see new sprouts next spring without replanting.

For winter interest, plant ornamental grasses near the base of your trellis to catch falling aster seeds and add texture. In early spring, remove old mulch and compost again before new growth appears. This combo keeps your vertical garden vibrant from early summer through frost.

Tips & tricks for perfect year-round climbing gardens

Creating a thriving vertical garden with asters and morning glories takes a little strategy—but these tips will help you avoid common pitfalls and maximize that stunning seasonal display.

Light Balance is Key: In Step 1, when positioning your trellis, remember morning glories need that full sun (6+ hours) while asters prefer morning sun only (4-6 hours). I've found the perfect spot is where morning glories get afternoon shade after 2 PM—this prevents their vines from getting too stressed while keeping asters happy. Test your location by observing sunlight patterns for a few days before planting.

Soil Prep Makes All the Difference: The 12-inch deep soil loosening in Step 1 is crucial, but don't stop there. I like to add a handful of perlite to the compost mix for even better drainage—especially if your soil tends to compact. For clay-heavy soils, mix in 1 part sand to 3 parts compost to create that ideal loose, airy texture both plants love. This prevents root rot that can kill morning glories.

Timing Your Planting Pays Off: That 2-3 week gap between morning glory sprouts and aster planting in Step 3 is important, but don't rush it. Wait until you see strong morning glory seedlings with their first true leaves before adding asters. I've learned the hard way that planting asters too soon can shock the morning glories' root systems. Also, mark your calendar—aster starts need warmer soil (60°F+) to thrive.

Trellis Training Secrets: When guiding morning glories in Step 4, use soft jute twine instead of wire—it's gentler on the vines and won't cut into them as they grow. I tie every 12-18 inches, but here's my pro move: I make the first tie at the base and the last tie at the top of the trellis before planting. This gives the vines immediate support as they start climbing. For extra drama, weave in ornamental grasses along the base as mentioned in Step 5—they'll catch falling aster seeds and add winter interest.

Frequently asked questions

Got questions about growing aster and morning glory together? Here are some of the most common ones—plus expert tips to help you succeed!

Can I grow asters and morning glories together in the same pot?

While both love climbing, asters are perennials (or sometimes biennials) with deeper roots, while morning glories are fast-growing annuals with aggressive vines. For small containers, pair them with caution—ensure the pot is at least 12–18 inches deep and wide. Larger garden beds or trellises work better for harmony! Pro tip: Plant morning glories first—they’ll climb faster and shade asters’ leaves, reducing stress.

How long does it take for morning glories to bloom after planting?

Morning glories are fast bloomers! With warm soil (60°F+) and full sun, you’ll see flowers in 4–6 weeks from seed. Asters, however, take longer—60–90 days—but their late-summer to fall blooms make them worth the wait. Speed tip: Start morning glory seeds indoors 2–3 weeks early for a head start!

Why aren’t my morning glories climbing my trellis?

Morning glories need something to grip—their tendrils wrap around structures like wire, string, or sturdy trellises. If they’re flopping, check for:

• Trellis height: At least 6–8 feet tall for full coverage.
• Support material: Avoid slick surfaces (like glass); opt for mesh, twine, or netting.
• Watering: Consistent moisture (but not soggy soil) encourages vigorous growth.

Are there non-toxic alternatives to morning glories for edible gardens?

If you’re concerned about toxicity (morning glories contain beta-carboline alkaloids), try these edible climbing companions:

• Cherry tomatoes (compact varieties like ‘Tiny Tim’)
• Peppers (e.g., ‘Shishito’ or ‘Jalapeño’)
• Cucumbers (bush types like ‘Bush Champion’)
• Nasturtiums (edible flowers + pest-repellent!)

Will asters survive winter in cold climates?

Most aster varieties are hardy perennials (zones 3–8), but protection helps! In freezing temps:

• Mulch: Apply 3–4 inches of straw or shredded leaves around the base after the first frost.
• Cover: Use a cloche or frost blanket for young plants in zones 3–5.
• Prune: Cut back dead foliage in early spring to encourage new growth.

Wrapping up and next steps

From the bold aster’s late-summer blooms to the morning glory’s cheerful twists, these two beauties bring year-round charm and effortless growth to any garden. Their easy-care nature and vibrant colors make them perfect for climbers, containers, or borders—ideal for both beginners and seasoned gardeners.

Ready to transform your space? Start by choosing your favorites, gathering supplies, and planting with confidence!

Next step: Pick a sunny spot, grab your gloves, and let these climbing stars work their magic! 🌿✨