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USDA Plant Hardiness Zones

To help gardeners understand which plants will grow well for them, the entire USA has been segmented into ‘Plant Hardiness Zones’. Knowing your zone number is helpful when shopping for plants because:

  • Cold-area gardeners can avoid buying plants that simply won’t survive their lowest winter temperatures.
  • Warm-area gardeners can steer clear of plants that need a period of cold weather in order to bloom again.
Find your Plant Hardiness Zone here.

Semi-Cactus Dahlia Striped Vulcan

 

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This Semi-Cactus Dahlia boasts bright yellow petals striped with red. The double blooms are pointed, making the flower shape between a Decorative and Cactus Dahlia. Striped Vulcan requires almost no care, growing in any sunny spot and blooming from mid summer to frost. Growing to be about 44-52” tall, plant this taller variety among your favorite perennials in the garden bed or in containers. The bold, vibrant blooms attract butterflies and hummingbirds and create a spectacular show in any summer garden.

Zones 2 - 10
Advantages
Attract Butterflies
Attract Butterflies
Easy to Grow
Easy to Grow
Cut Flowers
Cut Flowers
Extended Blooms
Extended Blooms
Light Requirements
Full Sun
Full Sun
Mature Plant Size 44-52" tall
Bulb Spacing1 bulb / tuber per sq. ft.
Bloom Time Mid summer until frost
Size Bag of 3
SKU ASB5S03

Plant Information

Why Gardeners love Dahlias: Dahlias are one of the most rewarding summer flowers of all. They're really easy to grow with spectacular results. If you know them, you know all about it. If you don't, here is the information you need. Prepare to become 'hooked.' First of all, Dahlias are great for cutting, as you can see in the large top photo of an arrangement showing a lavish deep red dahlia right next to a large, voluptuous rose. Dahlias are native to Mexico, but there's about as much resemblance between the original and the Dutch hybrids as there is between an old toy car and a brand new Mercedes. Dahlias for today's gardeners offer a really big gardening treat. The 'bulbs' are actually tubers, and look a lot like peony roots--sort of like a bunch of carrots. The plants grow quickly and some grow quite tall, always with lush deep green foliage.

Types of Dahlias: These plants have been hybridized into various heights from short bedding plants to tall bushy ones. But they are officially categorized by flower type or shape. The term, 'Dinnerplate Dahlia' is probably the most famous description, and though all gardeners use the term, it is not an official classification. 'Dinnerplates' are, simply put, the large plants with the huge flowers. The always-double flowers are up to 8', sometimes a whopping 10' across, so the name makes sense. Here are the official classifications:

'Decorative Dahlias' This group includes the Dinnerplates and also other taller (to 4 ft.) plants with double, chrysanthemum-like flowers. The famous 'Shogun Dahlias' are as tall as Decoratives, but have very heavy bloom of smaller bi-colored flowers for gardeners who want a large bushy plant covered with color.

Growing Dahlias: All the gardener needs to do is plant the tubers after spring frosts in good garden soil with full sun. It's best to position them against a wall or be ready to stake them, since they are brittle, and must be protected from high winds. (If you've grown perennial Delphiniums, the plant size and growth is similar, but success with Dahlias is much easier.) Keep them free of bugs, well-watered, and well-fertilized as they grow, and your dahlias will begin to set buds by midsummer and be in full bloom, usually during July or August. Then the huge flowers keep coming until frost. When frost threatens, just pull the roots up, cut off the stems, and store the tubers until the following spring. Each fall, you'll be amazed how the 'bulbs' have multiplied during the summer, giving you more and more to divide and enjoy the next year.

One expert has said, 'Never have so many gardeners received so much for so little work, as when they grow dahlias.''

SKU ASB5S03
Common Name Semi-Cactus Dahlia
Botanical Name Dahlia
Zones 2, 3, 4, 5, 6, 7, 8, 9, 10
Ships As Bulb, Rhizome, Tuber
Light Requirements Full Sun
Flower Color Orange
Mature Height 44-52" tall
Bulb Spacing 1 bulb / tuber per sq. ft.
Planting Depth Bulbs/Tubers should be planted 1" to 2" below the soil line.
Bloom Time Mid summer until frost
Plant Type / Life Cycle Annual
Planting Time Spring / Summer
Soil Type Sandy Soil, Loamy Soil, Acidic Soil
Soil Moisture Average, Well Draining
Advantages Attract Butterflies, Easy to Grow, Cut Flowers, Extended Blooms
Additional Information Hardy in zones 8-10
Poisonous or Toxic to Animals Tubers and leaves are toxic if eaten in large amounts.
Ships to Hawaii, Alaska & Canada No

Shipping

Most orders ship within 48 hours or less.

As soon as your order is placed you will receive an order confirmation email that will include your shipping information. We ship perennials and spring-planted bulbs at the proper planting time for your hardiness zone. Perennials and spring-planted bulb orders will arrive separately from seeds. If your order requires more than one shipment, there is no additional shipping charge. See our shipping information page for approximate ship dates and more detailed information. If you need express shipping or have any questions, please call Customer Service toll-free at (877) 309-7333 or contact us by email.

You will receive a second email the day your order ships telling you how it has been sent. Your order is scheduled to arrive at your door, fresh and ready to plant, usually within 3-5 days of leaving our warehouse, depending on your shipping address. We pack our plants to withstand up to 10 days in transit, in the event transit is delayed. We cannot guarantee arrival on a specific day. Please make sure to open your package upon receipt and follow the instructions included.

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USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

Find Your Planting Zone:

Enter your Zip Code to find your USDA Planting Zone

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