Another tall sunflower is the michaelmas-daisy or maximilian sunflower (Helianthus maximiliani) which grows to a height of 3-10 ft. Leaves are long and narrow, up to 10 inches near the bottom and ...

Perennial sunflowers range in height from 2 to 10 feet tall and they are drought tolerant and not fussy about their growing conditions. The dark green leaves create a striking contrast with the ...

I like the varieties of swamp sunflower (Helianthus angustifolia) that are more softly yellow than the norm. Lemon Queen is widely admired by serious gardeners for its clean creamy yellow petals ...

It’s a hardy perennial in Zones 3-9 and grows well in dry-to-moderate soil moisture. Plant these as a winter sowing or cold stratify them for spring planting. Swamp sunflower (H. angustifolius).

Perennial varieties spread by rhizomes so need to be spaced 2-3 feet apart. Fertilizing at planting time helps the roots grow strong, which protects the plants from blowing over.

Yum! You could plant shade-loving veggies underneath them as Helianthus tuberosus can get up to 10 feet tall. Plants grow from mid-spring until the frost comes in late fall.

Next, we turn to Helianthus, perennial sunflowers. These stately plants are great for the back of the border as the can reach 7 to 8 feet. My personal favourite is Lemon queen which carries its ...

Mitotic and meiotic studies in annual Helianthus annuus (2n = 2x = 34) and perennial Helianthus resinosus (2n = 6x = 102) as well as the F₁ hybrids between both species were carried out. Chromosome ...

Helena Jacoba / Flickr / CC BY 2.0 A tuber that’s related to the pea, the American groundnut is a perennial vegetable that can be a great addition to any garden. The plant—which grows as a ...

Edward E. Schilling, C. Randal Linder, Richard D. Noyes, Loren H. Rieseberg, Phylogenetic Relationships in Helianthus (Asteraceae) Based on Nuclear Ribosomal DNA ...