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The best plants to place at the base of a clematis are those that provide shade for its roots, retain soil moisture, and complement its vertical growth.
When you’re figuring out what to plant at the base of a clematis, the goal is to mimic the plant’s natural woodland habitat where the roots stay cool and the vines scramble up toward the sun.
Clematis are famous for having “heads in the sun and feet in the shade,” so choosing the right companions is essential for a thriving display.
In this post, we’ll dig into the best options for what to plant at the base of a clematis, why these pairings work, and how to create a beautiful, layered planting scheme.
Let’s get our hands dirty.
What To Plant At The Base Of A Clematis For Root Shade
The secret to a happy clematis is keeping its root zone cool and shaded, and that’s exactly why you need to know what to plant at the base of a clematis.
While the foliage and flowers crave full sun to bloom their best, the roots hate baking in the heat.
A dense layer of low-growing plants acts like a living mulch, shielding the soil from direct sun and keeping moisture levels more consistent.
Let’s look at the top performers for this important job.
1. Hardy Geraniums (Cranesbill)
Hardy geraniums are a classic choice when deciding what to plant at the base of a clematis.
They form a clump of leafy growth that spreads nicely but stays low, usually under 18 inches tall.
Their broad leaves create a canopy that shades the clematis roots perfectly.
Plus, they offer their own charming flowers in blues, pinks, and purples from late spring through summer.
The key is that hardy geraniums won’t compete aggressively with the clematis for water, they just sit there looking pretty and doing their job.
They’re also tough and adaptable, so they’ll thrive in the same well-drained soil that clematis loves.
2. Alchemilla Mollis (Lady’s Mantle)
If you’re wondering what to plant at the base of a clematis for a soft, romantic look, lady’s mantle is a brilliant pick.
Its scalloped, velvety leaves catch raindrops and dew beautifully, creating a lovely textural contrast at the base of the vine.
It grows in a mounding habit that doesn’t get too tall or floppy, making it an ideal groundcover under clematis.
The chartreuse yellow flowers appear in early summer and add a gentle pop of color that works with any clematis bloom.
Lady’s mantle is also drought-tolerant once established, which helps if you have dry spots near a fence or wall where clematis often grow.
3. Nepeta (Catmint)
Catmint is another stellar answer to what to plant at the base of a clematis, especially if you want long-lasting color.
It produces spikes of soft lavender-blue flowers that bloom for weeks, attracting bees and butterflies to your garden.
The aromatic gray-green foliage forms a neat, spreading mound that does a fantastic job of shading the soil.
Nepeta thrives in full sun, which means it can handle the open, sunny spot at the base of your clematis without any trouble.
It’s also deer-resistant and low-maintenance, so you can plant it and basically forget it while it keeps your clematis roots happy.
More Great Companions For What To Plant At The Base Of A Clematis
Beyond the usual suspects, there are some other fantastic plants that work wonders when paired with clematis.
The trick is to think about the growing season and what kind of look you want at the base of your vine.
Here are a few more ideas to round out your planting scheme.
1. Heuchera (Coral Bells)
Heuchera is a superstar when thinking about what to plant at the base of a clematis, especially in shadier spots.
These plants come in a huge range of leaf colors, from deep purple to bright lime green, adding incredible year-round interest.
The foliage is dense enough to cover the ground well and keep the clematis roots cool and moist.
They also produce delicate flower spikes in early summer that add a light, airy feel to the base of your vine.
Heuchera prefers partial shade, so if your clematis is planted where the roots get afternoon shade, this is a perfect match.
2. Campanula (Bellflower)
For a touch of whimsy, campanula is a lovely option for what to plant at the base of a clematis.
Depending on the variety, you can get low-growing, spreading types that form a carpet of star-shaped flowers.
These blooms come in blues, purples, and whites, which pair beautifully with most clematis colors.
They’re hardy perennials that will come back year after year, filling in gaps and keeping weeds at bay.
Just be sure to pick a well-behaved variety that won’t take over your clematis, stick to clumping forms like Campanula carpatica.
3. Perennial Geraniums (Bigroot Geranium)
Bigroot geraniums deserve a special mention when discussing what to plant at the base of a clematis because they’re incredibly reliable.
They have thick, fragrant foliage that turns brilliant shades of red and orange in the autumn, giving you extra seasonal interest.
They’re also one of the toughest groundcovers, tolerating poor soil, heat, and drought once established.
This makes them a no-fuss solution for shading clematis roots in tricky spots.
Their pink to magenta blooms appear in late spring, providing a cheerful splash of color before the clematis really takes off.
Best Practices For Planting At The Base Of A Clematis
Once you’ve chosen what to plant at the base of a clematis, proper planting technique will help everything thrive together.
Start by planting your clematis deeply, with the crown about 3 to 4 inches below the soil surface, which helps protect it from wilt.
Then, you can add your companion plants around the base, taking care not to crowd the main stem too tightly.
Leave a small gap of about 4 to 6 inches around the clematis stem to allow air circulation and prevent rot.
Water everything well after planting and add a layer of organic mulch, like bark chips or compost, around the whole area.
This combination of living plants and organic mulch will keep the roots cool, the soil moist, and your clematis blooming beautifully.
1. Timing Your Planting
The best time to plant both your clematis and its companions is in the spring or early fall.
This gives the roots time to establish before the heat of summer or the freeze of winter arrives.
If you’re adding companions to an existing clematis, be careful not to disturb the established root system too much.
Gently dig small holes for your new plants, taking care to avoid cutting through clematis roots.
2. Spacing And Maintenance
Give your companion plants enough room to spread to their full size without smothering the clematis.
A good rule of thumb is to space them so they’ll just touch each other when mature, creating a solid carpet of foliage.
You can also prune back some vigorous groundcovers in late winter to keep them in check.
Regular watering during dry spells is crucial for the first growing season until everything gets established.
So, What Should You Plant At The Base Of A Clematis?
So, what to plant at the base of a clematis really comes down to choosing low-growing, shade-giving perennials that share similar soil preferences.
The best plants to place at the base of a clematis are hardy geraniums, lady’s mantle, catmint, heuchera, campanula, and bigroot geraniums.
These companions all excel at keeping the clematis root zone cool, retaining moisture, and providing a beautiful, finished look to your garden.
When you plant these at the base of your clematis, you not only solve the issue of sun-scorched roots but also extend the beauty of your planting scheme.
So go ahead and try these ideas and you’ll enjoy a healthier, more vibrant clematis for years to come.