That’s because trees usually have large root systems, and the last thing you want is for these roots to intrude, infiltrating your septic system.
Speaking of intruding, don’t dig too deep when cultivating the soil. Some drain and supply lines may be right below the soil surface, so never till the ground as you dig in your plants.
Do it by hand, so you can feel what you’re working with and stop if you hit something that should be avoided.
Septic systems need to breathe, believe it or not, so you don’t want to plant dense ground covers or plants that will capture debris either.
1. Agapanthus
Whether you call them lilies of the nile, African lilies, or agapanthus, the flowering plants in the Agapanthus genus are easy to love.
Their clusters of trumpet-shaped flowers steal the show all summer and fall. And even when the flowers aren’t around, the strappy, grass-like foliage is appealing all on its own.
If you live in Zones 6 to 11, you can fill your leach field with these deer-resistant beauties.
For the classic blue-purple options, grab three, six, or nine bare roots at Eden Brothers.
Learn how to grow your own agapanthus here.
2. Blue Fescue
If you need a little evergreen, or semi-evergreen, depending on your location, color in your septic field, check out blue fescue (Festuca glauca).
This quick-growing grass grows in foot-tall clumps in Zones 4 to 8.
Use it in clusters for a carpet-like appearance, as an accent, or as a border for taller plants.
You can find blue fescue grass in one-gallon containers available at Fast Growing Trees.
3. Butterfly Weed
If you want to attract butterflies to your garden, you can’t go wrong with butterfly weed (Asclepias tuberosa).
Hardy in Zones 3 to 9, the orange-yellow flowers that pop up in the summer attract pollinators and add vibrant color to your septic field.
To introduce pleurisy root to your garden, purchase a packet of 30 seeds at Earthbeat Seeds or live plants in a three-pack of three-inch containers at Nature Hills Nursery.
Learn more about growing butterfly weed and other types of milkweeds.
4. Cast-Iron Plant
Aspidistra elatior is a fantastically tough plant for those who live in Zones 8 to 10.
Many people know cast-iron plant as a houseplant, but this fantastic foliage plant makes an excellent outdoor specimen, hedge, or grouping plant for warmer climates.
The leaves come in an exciting range of colors and patterns, with some featuring stars, stripes, and splotches of light green, yellow, or white.
They also produce small, strange flowers that only outdoor gardeners will be able to grow easily.
And don’t worry one bit about flooding. If your field runneth over, these plants will be just fine. Same thing with drought and general neglect – they can handle it.
Find live plants in one- or three-gallon containers at Fast Growing Trees.
5. Columbine
A self-seeding, short-lived perennial, columbine (Aquilegia spp.) is just perfect if your septic field receives a bit of shade.
The red, orange, yellow, purple, blue, violet, white, or pink flowers will bloom nicely in a partial shade exposure, and this hummingbird favorite will bloom for up to a month.
Can’t commit to just one color? True Leaf Market has packs of 10 seeds available in a mix of multiple pastel colors.
Or, grab about 130 seeds of ‘McKana Giants’ in a blend of colors from Botanical Interests.
Find cultivation tips in our guide to growing columbine.
5. Crocus
Crocuses (Crocus spp.) are famous for their early spring color, but some types bloom in fall and winter.
Grow a mixture for some long-lasting interest, or mix spring bloomers with something different that will offer up summer color, like daylilies.
With over 80 species and tons of hybrids available there are lots of crocuses to choose from, and you’ll find options suitable for Zones 3 to 8.
Bring home a mix of yellow, white, and violet spring-blooming jumbo crocuses (C. vernus) in 25, 50, and 100 counts from Eden Brothers.
Read our guide to learn more about growing crocuses at home.
7. Daffodil
Daffodils (Narcissus spp.) are always a welcome sight in the spring.
The bright yellow – or white, pink, or orange – blossoms rise up like little bits of sunshine, and you can use them to shine up blah spots like a septic field.
You can find cultivars that will grow in Zones 4 to 8, and they’ll return reliably year after year with hardly any work from you.
Daffodils have come a long way if you haven’t grown them in a while.
‘Replete’ is pink at its ruffled center, surrounded by creamy white outer petals. It’s drought-tolerant, tall, and attention-grabbing.
You can make 10, 20, 50, or 100 ‘Replete’ bulbs yours by visiting Eden Brothers.
‘Tahiti’ is a unique double daffodil with pale yellow petals surrounded by smaller, ruffled petals in vibrant red-orange.
Grab 10, 20, 50, or 100 bulbs of this vigorous, tough daffodil at Eden Brothers.
Learn more about growing daffodils here.
8. Dahlia
It’s pretty obvious why dahlias (Dahlia spp.) have garnered such a loyal following of ardent fans. They’re stunning. A massive dinnerplate dahlia is truly impossible to compete with.
Thanks to their shallow root systems, they’re perfect for septic areas, so long as you live in Zones 8 to 10 or you’re willing to dig up and protect the tubers during the winter.
‘Labyrinth’ is a stunner, with cupped petals that have a pink and peach hue.
Pick up two, four, or eight of these dinnerplate type tubers at Eden Brothers.
A stand of these alone would be incredible enough, but they’d be even prettier mixed with something like the semi-cactus type ‘Black Narcissus,’ which has thin, deep red, almost black petals.
It’s also available at Eden Brothers in two-, four-, or eight-packs.
Read our guide to learn all about growing dahlias.
9. Foxglove
Fabulous foxgloves (Digitalis purpurea) are instantly eye-catching. The tall spires of tubular blossoms are painted in vibrant colors with playful speckles in their throats.
As a biennial, foxglove only flowers in its second year. But let it self-seed away and you’ll have a steady supply of blooms – provided you live in Zones 4 to 10.
Purchase a 500-miligram, one-ounce, or four-ounce pack of a purple and white mix of seeds at True Leaf Market.
Need foxglove growing tips? Our guide will show you how!
10. Gladiolus
Gorgeous gladioli (Gladiolus spp.) are forgiving plants that will tolerate less-than-ideal conditions, all while still putting on their colorful show.
You don’t have to worry about intrusive roots with these plants either. If you’ve ever planted a corm, you know they don’t go too deep.
These plants will return year after year in Zones 8 to 10, and you can grow them in colder areas as annuals or you can lift and overwinter the corms. Hardy glads are perennial in Zones 5 to 8.
Imagine the rosy pink, pale yellow, and cream spires of ‘Mon Amour,’ available at Eden Brothers in 10-, 50-, and 100-bulb packages.
Or what about the dark wine red pillars of ‘Black Star,’ also available at Eden Brothers, standing tall at the back of your field.
It would be a pretty incredible addition to a space that is usually a bit of a bore.
Find our guide to growing gladiolus here.
11. Grape Hyacinth
Grape hyacinth (Muscari spp.) is a reliable, sweet-smelling little cutie that looks like a cluster of grapes.
It has a bad reputation for invading lawns, but I say these plants can make a welcome addition to an area that is usually totally homogenous.
If you have grass covering your leach field, add some grape hyacinths for color and fragrance. Otherwise, grow them in big clusters with other spring-blooming bulbs.
These tough little plants grow well in Zones 3 to 9.
I love the traditional purple, and you can grab packages of 16 bulbs from Burpee if you’re craving a classic. But there are some pretty beautiful alternatives out there.
Read our guide for grape hyacinth growing advice.
12. Hellebore
Hellebore (Helleborus spp.) is such a welcome relief to the winter blahs in shady corners. And in Zones 3 to 9, you can enjoy Christmas roses in all their glory.
These plants can use a little assistance during the summer, since they stop blooming and fade by the fall.
Plant something else as well that provides late-season interest, like coleus or hydrangea.
Lenten roses don’t need to offer anything more than their beautiful flowers and attractive foliage to be worth having around, but some will even give you changing colors.
For example, the Gold Collection® hybrid starts out ballet pink, but as the blooms age, they take on a dark cranberry hue.
Sound like just the thing? Find plants at Nature Hills Nursery.
Learn more about growing hellebores.
13. Iris
Irises (Iris spp.) are perennial favorites because you can rely on them to give you intense garden color year after year. They’re also extremely tolerant of wet, poorly drained soils.
Depending on the species, irises will grow in Zones 3 to 9. Consider planting them with other species, like dahlias or daylilies, that will bloom later in the summer for a continual show.
I’m a particular fan of ‘Silver Edge,’ a Siberian iris with bright blue petals edged in silver, with yellow throats.
Eden Brothers carries sets of two, four, or 10 bare roots if you’d like to grow this pretty plant.
Find tips for growing irises here.
14. Lady’s Mantle
Fast-growing, viridescent, and tough as nails, lady’s mantle (Alchemilla mollis) might not be your first thought when it comes to ornamentals, but it should be.
The plant forms clumps of scalloped leaves topped with chartreuse flowers in the spring, and while the flowers aren’t the draw, they’re awfully sweet.
Just beware that this plant is considered invasive in some areas, so determine whether it’s allowed in your neck of the woods before planting.
If it is, you’ll have a robust self-seeder that will happily fill your entire septic field if you want.
‘Thriller’ is a delightful cultivar with larger leaves than the species plant.
Find plants in #1 containers at Nature Hills Nursery.
Our guide explains best practices for growing lady’s mantle.
15. Lily
There are lots of plants in the Lilium genus, each prettier than the last, and each perfect for planting in a drain field.
Just imagine turning an ugly functional area into a beautiful garden filled with flowering lilies from summer into fall.
If you live in Zones 4 to 9, mix summer-flowering lilies with spring-blooming bulbs like tulips or grape hyacinth for multi-season interest.
Visit Eden Brothers to grab three, six, or nine ‘Stargazer’ bulbs.
The hot pink petals are edged with white, with spots in the center.
Read our guide to growing lilies for more info.
16. Oatgrass
Plants in the Danthonia genus play nicely with septic systems.
California oatgrass (D. californica) is a popular option in western North America, and it makes an excellent lawn-like option without all the negatives that come with planting non-native grass lawns.
It’s nearly evergreen, doesn’t mind foot traffic, and does just fine in drought or wet conditions.
You can find oatgrass species that will grow in Zones 3 to 8. Check local nurseries for recommended options.
17. Sedge
Most sedges (Carex spp.) will do well in septic fields. Look for those that tolerate wet soil.
In addition to being tolerant of wet earth, many are also happy growing in shady areas. So that’s two tough spots to fill that you can tackle with one plant.
Sedges grow best in Zones 5 to 9. Do you live within that range? Then you’re lucky enough to be able to grow C. morrowii ‘Ice Dance.’
It has dark green leaves with a creamy edge, and Nature Hills Nursery carries plants in #1 containers.
Golden sedge (C. aurea) is another good choice. The golden-green, strappy leaves will add color and texture to the area.
Read our guide to growing sedges now.
18. Trillium
Spring ephemerals hold a special place in my heart, and trilliums (Trillium spp.) are one of my favorites.
With their three-petaled flowers and trio of large, oval or egg-shaped leaves, they’ll give you colorful interest in shady areas of your drainage field.
There are many beautiful native types that the local wildlife in Zones 4 to 9 will love.
If you live in the eastern part of North America, T. erectum, commonly known as red trillium, is native to your region.
Our growing guide sheds more light on trillium care.
19. Tulip
Nothing says “hello, spring” like tulips (Tulipa spp.).
Whether you grow them in patches combined with other species for a cottage garden look, or you intend to fill up your entire field with these popular bulbs, the result is going to be stunning.
Grow these reliable plants in Zones 3 to 7, or 8 and above with some special care, which involves lifting and storing the bulbs.
Don’t worry, it’s easy. The hardest part of growing tulips is picking just one or two types to plant.
If you like something showy and dramatic, ‘Double Bllizz’ is the way to go.
It has massive, double blossoms, with varying degrees of striping and speckling. For 10, 25, or 100 bulbs, head to Eden Brothers.
We cover all things tulip care in this guide.
20. Violet
Vivacious violets (Viola spp.) will form a carpet of color when allowed to reseed naturally.
You can find ones that will bloom everywhere from Zone 2 to 10, and you can buy native species that will attract pollinators. Plus, they’re fabulous for filling in a shady area.
For something a little different, try Corsican violets (V. corsica). They have large, bright purple blossoms that will happily reseed around your drainage field.
Read our guide to learn all about growing violets.
21. Yarrow
Achillea millefolium, commonly known as yarrow, is a trouble-free herb with lacy green leaves and bright white, yellow, pink, purple, or red flowers.
It’s so able to care for itself that it can become pretty aggressive in certain conditions – that’s why you’ll see it naturalized in disturbed areas.
But this is perfect if you want to fill in a septic field in full sun in Zones 3 to 9.
A cluster of one color would be striking, but a patch of red, rose, pink, yellow, and white blooms would be pretty lovely, too.
Grab 50 milligrams of seeds from Botanical Interests and watch this ‘Colorado’ blend fill your space.
Our guide to growing yarrow is available here if you need any assistance!
