Seed plants, or spermatophytes, are plants like pines, flowers, grasses and palms that produce seed. Seedless plants are like mosses and liverworts. Plants with seeds can be propagated directly from the seed they produce, making it easier to expand your garden plot. Seed plants are typically large and showy as opposed to nonseed plants that are inconspicuous.
Black-eyed Susan
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Rudbeckia hirta, or the black-eyed Susan, is a ray flower that attracts butterflies. Flowers appear the second year of growth on stems 3 feet high. Leaves are hairy and lance-like. Plant a black-eyed Susan in full sun or light shade in any soil. Water regularly it although it is somewhat drought-tolerant. Flowers should be deadheaded for longest bloom time. Propagate by see or by root mass division. Hardiness ranges from USDA Zones 3 through 10.
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Switchgrass
Panicum virgatum, or switchgrass, is a drought-tolerant perennial grass that attracts birds. It grows 3 to 6 feet high with flat glossy leaves. Flowers have a reddish-purple hue and are in panicles. The shiny seeds look like teardrops. Plant a switchgrass in any soil with partial shade. It tolerates occasional flooding but not persistent high water. It needs to be burned every 3 to 5 years for best growth. Propagate by seed or shoot division. Hardiness ranges from USDA Zones 4 through 9.
Screw Pine
Pandanus utilius, or the screw pine, is a drought-tolerant evergreen tree. It grows 30 feet high with spreading, toothed, linear leaves. Dark green leaves have a stiff, waxy texture. Plant a screw pine in full sun or partial shade with any moist soil. Propagate by seed that have been presoaked for a day, by suckers, or by cuttings. Hardiness ranges from USDA Zones 10 through 11.
Bolivian Sunflower
Tithonia diversifolia, or the Bolivian sunflower, is a fast-growing fragrant perennial. It grows 16 feet tall and 12 feet wide. Its yellow-orange ray flowers have a honey scent. The leaves are large, hairy and coarse. Plant a Bolivian sunflower in full sun in hot dry climates with well-drained soil. Propagate by seed or stem pieces. Hardiness ranges from USDA Zones 9 through 11.