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Hardiness Zones / 13


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Zone 13

Hardiness zone 13: lowest average temperatures of 60°F and 70°F or +15.6°C and +21.1°C

Based on the minimum ten-year average winter temperatures, plant hardiness zones maps have been progressively developed, first by the Department of Agriculture (USDA) for the United States and then more or less applied to the rest of the planet. The purpose of these hardiness zones is to identify how well plants will withstand the cold winter temperatures of these zones. The USDA Hardiness Zone Map divides North America into 13 zones. The range of minimum average temperatures for zone 13 is between 60°F and 70°F or +15.6°C and +21.1°C. If you are planning to buy a shrub, perennial or tree, you need to make sure that this new plant will tolerate year-round conditions in your area. Therefore, to ensure your new acquisition will survive and grow year after year, you will need to compare the hardiness zone of your area with the hardiness zone of your plant.

Zone 13 Guides


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Dypsis decaryi (Triangle Palm)

Exceptionally handsome, Dypsis decaryi (Triangle Palm) is a small to medium sized palm adorned with a solitary trunk topped with a three-ranked crown of gray-green to blue-green, keeled, feather leaves. The common name of this palm comes from the triangular shape that is formed by three distinct points where the fronds emerge.

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Hibiscus coccineus (Scarlet Rose Mallow)

Vigorous, Hibiscus coccineus (Scarlet Rose Mallow) is a woody-based perennial noted for its 5-petaled, bright crimson red flowers, up to 3-5 in. across (7-12 cm). Blooming from mid-summer to early fall, the eye-catching flowers are adorned with conspicuous, protruding, creamy-white to pale yellow tubes of stamens. But even without these gorgeous blooms, this plant is worth growing for its shiny, palmately divided, deep green leaves.

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Senecio confusus (Mexican Flame Vine)

Pseudogynoxys chenopodioides (Mexican Flame Vine) is an attractive evergreen vine with fleshy, arrowhead-shaped leaves and large clusters of brilliant flowers over a long season. Blooming from late spring to fall (all year in mild winter areas), daisy-like, fiery orange-red flowers, adorned with golden centers, appear at the branch tips. Attractive to butterflies and bees, they gradually mature to red and give way to small dandelion-like puffs of seed. Perfect on trellis, cascading over walls or in hanging baskets.

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Trachelium caeruleum (Throatwort)

Tough and undemanding, Trachelium caeruleum (Throatwort) is an upright perennial, often grown as an annual, forming a clump of stems clothed with sharply toothed, lance-shaped, dark green leaves. Blooming over a long summer season, small, slightly fragrant, violet-blue flowers held in large domed clusters, 6 in. across (15 cm), appear above the foliage.

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Triteleia ixioides 'Starlight' (Ithuriel's Spear)

Free-flowering, Triteleia ixioides 'Starlight' is a cormous perennial boasting loose umbels, 5 in. across (12 cm), packed with star-shaped, pale yellow flowers adorned with a pale purple stripe down the center of each petal.

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Watsonia pillansii (Beatrice Watsonia)

Watsonia pillansii (Beatrice Watsonia) is a robust, cormous perennial with sword-shaped leaves and bright orange flowers. Blooming in mid-summer, eye-catching spikes of 20-35 tubular orange-red flowers, each about 2 in. long (5 cm), rise atop erect stems. A popular garden plant and a good cut flower, it is spectacular in mass displays and useful for soil retention on banks and slopes.

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