Lobelia Plant Zone. One of our best-known native wildflowers the Cardinal Flower adapts well to garden condition especially in moist areas beside ponds or water features. To -38 C 25 F USDA Zone 10a.
This colorful plant belongs to the Campanulaceae or bellflower family. Planting Lobelia in the Garden. Look for blooms for late summer to early fall.
Lobelia can grow in either a sunny or partially shaded part of the garden and prefer a moist humus rich soil that has a pH of between 6 and 75 Caring for Lobelia plants in the Garden.
If you wait any later than that and your lobelia may not have a chance to grow to maturity. One of our best-known native wildflowers the Cardinal Flower adapts well to garden condition especially in moist areas beside ponds or water features. Lobelia can grow in either a sunny or partially shaded part of the garden and prefer a moist humus rich soil that has a pH of between 6 and 75 Caring for Lobelia plants in the Garden. The perennial varieties are taller with some growing 2-3 feet high and others up to 4 feet in height.