English Lavender (Lavandula Angustifolia)

Type: Herbaceous perennial
Zones: 5 to 8
Dimensions: 2 to 3 feet tall, 2 to 4 feet wide
Growing conditions: Full sun; dry to medium, well-drained soil

Black-Eyed Susan (Rudbeckia Hirta)

Type: Herbaceous perennial
Zones: 3 to 9
Dimensions: 2 to 3 feet tall, 1 to 3 feet wide
Growing conditions: Full sun; dry to medium, well-drained soil

Autumn Joy (Sedum Herbstfreude)

Type: Herbaceous perennial
Zones: 3 to 9
Dimensions: 1 to 2 feet tall and wide
Growing conditions: Full sun; dry to medium, well-drained soil

Purple Sensation (Allium Hollandicum) Flowers

Type: Ornamental onion
Zones: 3 to 8
Dimensions: 2 to 3 feet tall, 1 to 2 feet wide
Growing conditions: Full sun; dry to medium, well-drained soil

Little Bluestem (Schizachyrium Scoparium)

Type: Perennial grass
Zones: 3 to 9
Dimensions: 2 to 4 feet tall, 18 to 24 inches wide
Growing conditions: Full sun; dry to medium, well-drained soil

Prairie Dropseed (Sporobolus heterolepis)

Type: Perennial grass
Zones: 3 to 9
Dimensions: 2 to 3 feet tall and wide
Growing conditions: Full sun; dry to medium well-drained soil

How to Add Plants to a Gravel Garden

Now it's time for the part you've been waiting for—putting in your plants into the gravel. For this, you'll want to use drought-tolerant native plants with deep root systems. You shouldn't plant seeds in a gravel garden, since it's harder for the roots to establish.

"When we plant, we typically use 3.5 or 4.5 inch pot size perennials, because they're about the correct depth," says Epping. "If you use a gallon pot, they're actually too big and you have to end up shaving off some soil to get them in."

Lay out your potted plants in the areas you want them to grow, keeping each about 12 to 18 inches apart.
Remove the plant from the pot and hover it over a bushel basket.
Over the basket, peel off the top inch of soil to remove any weed seeds from the nursery before planting.
Dig about 4 to 5 inches deep, past the gravel and into the soil, and insert the root ball.
Fill the area back in with soil and gravel. The gravel should touch the crown of the plant (where the stem meets the roots).

Zinnias flowers

Zinnias come in a variety of colors and grow large blooms. With full sun access, these flowers can reach up to 4 inches in height. "This is a flower we recommend giving a 'pinch' when they reach 12 to 18 inches tall to promote branching and flowering on the plant," say the O'Neals. "The more you cut zinnias, the more blooms they produce."

Do note that you should cut a zinnia when it's fully mature. The best way to tell that it's reached this point is by giving it a wiggle test, they say. Bounce the stem between your index and middle finger, and if the stem is rigid, it's ready to be cut. When the stem is floppy, it's not ready to cut and won't stand up straight in the vase. After cutting your zinnias, they will last for about seven to 10 days, however, they are known as a "dirty" flower, say the O'Neals. "Their stems are hairy, so they make vase water murky quickly," they say. "We recommend changing the water for a vase with these flowers once a day, retrimming the bottom of the stems each time."

Celosia flowers

When exposed to full sun, the celosia, specifically Celosia argantea, will grow vibrant, feathery blooms, which the O'Neals say are a great filler in bouquets. "This type of celosia can be pinched at 18 inches if you want to keep it a bit shorter," they say. Like zinnias, make sure the stem is rigid before cutting.

Salvia flowers

For a beautiful blue bloom, consider growing salvias. The Salvia blue bedder is a favorite of the O'Neals, and it can be grown as a perennial in zones 8 to 10. "Salvia serves as a supporting filler and adds a striking pop of color in a bouquet," they say. "Salvia is a bloom we give the wiggle test to, to see if it's mature to cut."