Crown vetch is a perennial ground cover that some gardeners know as "coronilla" or "scorpion senna." During midsummer, the foliage of crown vetch will have small flowers that may be white, yellow, pink or purple (depending upon the variety). Crown vetch grows and spreads so easily that some gardeners consider it an invasive plant. For this reason, consider carefully whether you want to include this ground cover in your landscape.
Prepare a sunny garden area in the spring, when all threat of frost is over for the season. Work the soil with the garden spade down to a depth of 5 to 6 inches. Add 2 inches of compost to the top of the soil and work this in well. Rake the surface of the soil smooth.
Use the fingernail clippers to chip each seed, which will aid in germination. Scatter the seeds evenly over the entire surface of the prepared planting area. Spacing is not very important--simply strive to space them evenly, with 2 to 3 inches of soil between each seed. Cover the seeds with 1/4 inch soil and water the entire area lightly.
Keep the planting area evenly moist during germination and while the plants are becoming established. Once the crown vetch is growing well, little maintenance is required.
Trim back all of the crown vetch growth to just above the soil level in the autumn when the plants begin to fade.
Control the spread of crown vetch in the spring by digging up plants that have spread to areas outside of your desired planting area. Either replant these plants or discard them.