The upright stems of Abutilon 'Biltmore Ballgown' are festooned with dangling two-inch orange bells streaked with scarlet throughout summer.

Abutilon 'Nabob' produces masses of large, rich red, pendulous lanterns from spring through fall.

Acer palmatum 'Twombly's Red Sentinel' is a columnar Japanese maple with red spring foliage to brilliant red with orange hues in the Fall.

Achillea Desert Eve 'Red Improved' has brick-red flowers above fragrant, fern-like foliage.

Achillea millefolium 'Heartthrob' has large, flat-topped flower clusters with colourfast, velvet-red flowers above dissected, fern-like foliage.

Achillea millefolium 'New Vintage Red' has large, flat-topped flower clusters of bright red with white centres.

Agapetes serpens is a rare, evergreen shrub with arching stems that produce scarlet, pendulous flowers in spring.

Agastache Coronado Red is a long-blooming hummingbird mint with brilliant, fiery, orange-red, tubular flowers from late spring until fall.

Agastache Kudos 'Coral' hummingbird mint has bold coral-red flowers atop fragrant foliage for months in the sunny garden.

Agastache Kudos 'Red' hummingbird mint has bright true red flowers atop aromatic foliage for months in the sunny garden.

Agastache 'Summer Fiesta' has orange-red tubular flowers produced in firey masses all summer long. Great for hummingbirds.

Agastache Sunrise Red has tubular flowers in a gorgeous candy-apple-red from late spring to fall.

Agave macroacantha is a beautiful medium-sized century plant with numerous bluish grey leaves each tipped with a bold black spine.

Alcea rosea Spotlight 'Mars Magic' is a hollyhock with large, old-fashioned, single, red flowers with bright yellow eyes.

Allium cepa. 'Red Karmen' is a beautiful edible onion known for its red colour and deliciously sweet yet spicy flavour.

Allium karataviense 'Red Giant' is a large form with huge leaves and reddish purple flower heads up to 8 inches across!

Allium karataviense ssp. henrikki ('Red Globe') is a steroidal version of the species with huge leaves and reddish purple flower heads up to 8 inches across!

Aloe humilis 'Hedgehog' has flaming spires of orange-red flowers above attractive succulent foliage.

Aloe polyphylla is a stunning, rare succulent with light green leaves arranged in a mesmerizing spiral.

Aloe polyphylla 'Swirl' is a stunning, rare succulent with light green leaves arranged in a mesmerizing spiral.

Aloe 'Christmas Carol' is a small, striking, colony-forming cultivar with green leaves and dramatic glowing red, serrated edges.

Aloe 'Christmas Sleigh' is a small, striking, colony-forming cultivar with blue green to purplish leaves with dramatic, glowing, salmon-pink, serrated edges.

Aloe 'Delta LIghts' is a striking cultivar with broad, green leaves dramatically flecked with short creamy white lines.

Aloe 'Oik' is a small, striking, colony-forming cultivar with green leaves and dramatic glowing coral pink, serrated edges.

'Pink Blush' is a small, easy-to-grow Aloe with cute leaves in shades of white and pink with numerous raised bumps and stripes.