A single pot of petunias is pretty. A pot packed with a tall grass, mounding flowers and a vine spilling over the rim stops people on the sidewalk.
Good container plant combinations aren’t hard to build once you know a simple formula and a few rules.
In this guide, I’ll walk you through the method I rely on, the rules that keep pots looking good into fall, and 15 easy recipes for sun, shade, edibles and dry spots. Each one uses plants you can find at almost any garden center.
The Thriller, Filler, Spiller Method
The thriller, filler, spiller method is a three-part formula for designing a mixed pot. You pick one tall focal plant, a few mounding plants to fill the middle and a few trailing plants to drape over the edge.
Mixed pots work just as well up high, so see my list of the best plants for hanging baskets before you plant your next basket.
What Each Role Does
The thriller is the tall star. It gives the pot height and draws the eye. Think grasses, cannas, angelonia or salvia.
The filler is the mounding middle layer. It hides bare soil and makes the pot look full. Coleus, begonias, zinnias and impatiens all work well here.
The spiller trails over the rim and softens the container’s edge. Sweet potato vine, creeping Jenny, bacopa and calibrachoa are classic choices. Spillers are also the stars of hanging plants with pink and purple flowers, so you can borrow ideas from baskets too.
Where to Place Each Plant
For a pot that’s seen from all sides, put the thriller in the center. Arrange fillers in a ring around it, then tuck spillers along the outer edge.
For a pot that sits against a wall, put the thriller toward the back. Fillers go in the middle, and spillers line the front rim where they’ll show.
- Center thriller: best for patios, decks and entryways viewed from every angle
- Back thriller: best for pots against walls, fences or railings
- Spillers on two or three sides: gives a fuller, more balanced look
Gear That Makes It Easier
My advice is to start with a large lightweight planter, ideally 14 to 16 inches across or bigger. Lightweight materials like resin or fiberglass are easy to move, and bigger pots hold more soil, so they dry out more slowly.
I also recommend a slow-release fertilizer for containers. You mix the granules into the potting soil at planting time, and they feed your plants steadily for weeks. It’s the easiest insurance against hungry, pale plants.
Rules for Combinations That Last All Season
The best container plant combinations follow a few simple rules: match sun and water needs, plant closer than you would in the ground, and choose plants that grow at compatible rates. Get those right and your pot will look good from spring planting to fall.
Match Sun and Water Needs
This is the most important rule. Combine only plants with the same sun and water needs. A thirsty fern and a dry-loving succulent can’t share a pot, because one will always be unhappy.
Read each plant tag before you buy. Group “full sun, average water” plants together, and keep “part shade, moist soil” plants in their own pot.
- Full sun: 6 or more hours of direct sun a day
- Part sun or part shade: 3 to 6 hours, ideally morning sun
- Shade: less than 3 hours of direct sun, or bright filtered light
Plant More Densely Than in the Ground
Containers are meant to look full from day one. You can pack plants much more closely than you would in a garden bed, because you’re aiming for an instant, lush display.
A 14 to 16 inch pot usually holds 1 thriller, 2 to 3 fillers and 2 to 3 spillers. That’s about 5 to 7 plants total.
| Pot Diameter | Thrillers | Fillers | Spillers |
|---|---|---|---|
| 10 to 12 inches | 1 | 1 to 2 | 1 to 2 |
| 14 to 16 inches | 1 | 2 to 3 | 2 to 3 |
| 18 to 24 inches | 1 to 2 | 3 to 4 | 3 to 4 |
Balance Growth Rates and Colors
Some plants are bullies. Sweet potato vine and vigorous mint can swallow slower neighbors, so pair them with tough companions or plan to trim them often.
For color, keep it simple. Pick two or three main colors, or use foliage like dusty miller or silver dichondra to calm a busy mix. Contrasting leaf shapes, like spiky grass next to round coleus, add interest without extra color.
Sunny Container Combinations
Sunny container combinations use heat-loving annuals that bloom hard in 6 or more hours of direct sun. These five recipes are reliable, colorful and easy to keep going all summer.
Recipe 1: Angelonia, Lantana and Sweet Potato Vine
Angelonia is an upright thriller with spikes of snapdragon-like flowers. Lantana fills the middle with clusters of bright blooms that butterflies love. Sweet potato vine spills over the edge in chartreuse or deep purple.
This mix handles heat and humidity very well. Trim the sweet potato vine if it starts to crowd the lantana. Note that lantana is toxic to pets if eaten, so keep it out of reach of curious dogs and cats.
Recipe 2: Purple Fountain Grass, Calibrachoa and Bacopa
Purple fountain grass gives you graceful, burgundy arching blades and fuzzy plumes. It’s grown as an annual in most zones because it isn’t cold hardy. Calibrachoa fills in with masses of tiny petunia-like flowers, and white bacopa trails over the rim.
Calibrachoa likes slightly drier soil and regular feeding. Bacopa can drop flowers if it dries out completely, so check the pot often in hot weather.
Recipe 3: Salvia, Dwarf Zinnia and Trailing Verbena
Upright salvia, in blue, purple or red, makes a strong vertical thriller. Dwarf zinnias are compact fillers that bloom nonstop when you deadhead them. Trailing verbena spills over with clusters of small flowers.
This is a pollinator magnet. Bees, butterflies and hummingbirds all visit. Good air flow helps zinnias and verbena avoid powdery mildew, so don’t jam the pot into a tight corner.
Recipe 4: Geranium, Dusty Miller and Ivy Geranium
This is a classic for a reason. Upright zonal geraniums are the thriller, silvery dusty miller fills the middle, and ivy geraniums trail over the edge.
The silver foliage makes red, pink or coral geraniums really pop. Geraniums prefer to dry slightly between waterings. Snap off spent flower stalks at the base to keep new blooms coming.
Recipe 5: Dwarf Canna, Sun Coleus and Creeping Jenny
Dwarf cannas bring big, tropical leaves and bold flowers without towering over the pot. Sun-tolerant coleus fills in with colorful foliage. Creeping Jenny spills over in a bright gold carpet.
This combination likes steady moisture, so it’s a good fit for a large pot. Pinch coleus flower spikes off to keep the leaves full. If your summers are brutal, look at hanging plants that survive high temperatures for more heat-proof trailers.
| Recipe | Thriller | Filler | Spiller | Water Needs |
|---|---|---|---|---|
| 1 | Angelonia | Lantana | Sweet potato vine | Moderate |
| 2 | Purple fountain grass | Calibrachoa | Bacopa | Moderate |
| 3 | Salvia | Dwarf zinnia | Trailing verbena | Moderate |
| 4 | Upright geranium | Dusty miller | Ivy geranium | Low to moderate |
| 5 | Dwarf canna | Sun coleus | Creeping Jenny | Moderate to high |
Shade Container Combinations
Shade container combinations rely on bold foliage and shade-loving bloomers that thrive with less than about 3 hours of direct sun. These four recipes brighten porches, north-facing walls and spots under trees.
Recipe 6: Caladium, Impatiens and Creeping Jenny
Caladiums have huge heart-shaped leaves splashed with pink, red, white or green. They make a stunning thriller. Impatiens fill the middle with steady color, and creeping Jenny glows over the edge.
This trio loves warm weather and consistent moisture. Wait until nights stay warm before planting caladiums, because they sulk in cold soil. Caladiums are toxic to pets, so place this pot thoughtfully.
Recipe 7: Fern, Begonia and English Ivy
A Boston fern or Kimberly queen fern makes a lush, feathery thriller. Wax or tuberous begonias fill in with flowers, and English ivy trails over the rim.
Kimberly queen ferns are tougher and tolerate a bit more sun than Boston ferns. Both need even moisture. English ivy can be invasive in some regions, so keep it in the pot and dispose of trimmings in the trash.
Recipe 8: Coleus, New Guinea Impatiens and Torenia
Shade coleus is the thriller here, with leaves in lime, burgundy, pink and near-black. New Guinea impatiens fill the middle with large, bright flowers. Torenia, also called wishbone flower, trails gently over the edge.
New Guinea impatiens can handle a bit more light than standard impatiens. Keep this pot evenly moist, and pinch the coleus tips to keep it bushy.
Recipe 9: Heuchera, Browallia and Lamium
Heuchera, or coral bells, brings ruffled foliage in purple, caramel, lime o