(Cardinal Flower) Beauty that brings on more beauty, that is how we describe the Cardinal Flower, Lobelia cardinalis is no exception. Standing 2-4 foot tall, Lobelia cardinalis has a clumping habit and midsummer send up bright red flower spikes. Nestle right above the bright green foliage, the bright red flowers emerge on 2 foot flower spikes creating color for up to 5 weeks in the summer. Beauty brings on more beauty is the case with Lobelia cardinalis as the hummingbirds are sure to flock to your plants. Planted in full sun to filtered shade, Lobelia prefer moderate to moist soil conditions. Planted as a border or near the water's edge, Lobelia cardinalis is a stunning native to add to your garden.