You may know crossvine as quartervine or Bignonia capreolata. But whatever you call it, you will recognize it when you see the beautiful clusters of trumpet-shaped flowers that bloom in the spring. From a deep red to a tangerine color, this vine puts out more flowers on a branch than any other vine, and they attract butterflies and hummingbirds. The crossvine’s evergreen leaves will cover any wall, trellis or fence, because it clings to just about anything.
Choose a location with full sun to partial afternoon shade, near a structure for the vine to climb. The crossvine will bloom better in full sun. The structure can be a trellis, arbor or fence. It will climb a masonry wall or cover a wire form that you make for it. If you want to build a structure, do so before you plant the vine, or you may damage the roots. Make sure you do not block the young plant's ability to get sun.
Cultivate the soil by tilling or digging down 8 to 10 inches. Add 3 or 4 inches of compost to the soil for good drainage. The area dug should be three times the size of the root ball of the plant. Plants should be spaced 10 to 15 feet apart.
Plant the vine in early spring, to the same soil level it was in the container it came in. Water the plant well immediately after planting to establish the roots. Place about 2 inches of mulch around the base of the plant to keep in moisture and keep out weeds.
Water when the soil starts to dry out for the first two weeks, and then cut back to once a week. If you go through a hot, dry spell, you may need to water more. The crossvine does not need much water through the fall and winter.
Fertilize with a 5-10-5 in late winter. A light application is all that is needed. Then in midsummer use a slow-release 12-6-6.
Prune the vine after the spring bloom to keep it from taking over your landscape. You may also want to thin it out to keep air circulation flowing. These vines can be pruned up to 50 percent if needed to keep them the size you want them.