Dooley Hydrangea produces large mopheads of rich blue or pink, depending on soil pH. This is a vigorous growing, exceptionally cold hardy Big Leaf Hydrangea introduced by Dr. Michael Dirr. Hydrangeas are easy to grow deciduous shrubs that prefer partly shaded areas of the garden with a rich, moist but not wet, soil. Prune immediately after flowering to control size and shape. Provide midday and afternoon shade in hot southern climates.
With the Big Leaf or French Hydrangea, Hydrangea macrophylla
, the flower color (the sepals, as a unit they are florets, are actually the part we most enjoy but they do look so much like petals themselves) will vary depending on soil pH. Alkaline ph soils produce pink flowers, neutral pH soils produce purple, and acid pH soils produce the true blues. Actually it is the availability of Aluminum in the soil which is required for Hydrangea macrophylla
to produce the color pigment delphinidin. In acid soils you can imagine the Aluminum ions being literally dissolved into the acidic water and being absorbed by the roots of the plant. You can even lime one side of the plant and put Aluminum Sulphate on the other half and produce all three flower colors on the same plant if you get it right. In soilless mixes, like the peat moss or bark based potting soils that they are typically found growing in at the nursery, there is no Aluminum for the Hydrangea to take up, unless it has been added by the grower, therefore the flowers will end up being pink. With white flowered forms of the Big Leaf Hydrangea the florets generally remain white although they may blush pink or blue and the fertile flowers may be blue or pink depending on the soil pH.
Most pruning is generally done after flowering and should be completed before the end of summer. Timing may not be as critical with the repeat flowering Big Leaf Hydrangeas but is still the recommended practice for the best spring flower show the following year as well as overall plant vigor. Prune to shape as desired or to reinvigorate by removing no more than 1/3 of the oldest canes near ground level. We generally only do touch up pruning just before growth begins in spring just to remove the spent flower heads and remove any dead, weak, or freeze damaged wood. With periodic renewal pruning only if vigor seems reduced which is a rarity.
For more information on growing and selecting Hydrangeas below are some excellent online resources:
'Hydrangea Questions and Anserws' from The US National Arboretum
'Growing Bigleaf Hydrangea' from the UGA Extension by Gary L. Wade
'Check Out This Alternative Hydrangea' (Oakleaf Hydrangea) from LSU Agcenter by Richard Bogren
'Hydrangeas Provide Color in the Shade' from LSU Agcenter by Dan Gill
'Hydrangea Selection, Pruning, and Care' from Virginia Cooperative Extension byMike Andruczyk
'Hydrangeas' from Alabama Cooperative Extension Service by Kerry Smith, Jerry Chenault, and Kenneth Tilt
Dr. Michael Dirr's book Hydrangeas for American Gardens, ISBN 0- 88192-641-8, is probably the most in depth publication covering practically all Hydrangea species and all but the newest cultivars.
Grows To: 4-6'H x 5-7'W
This is the average expected mature height by width in feet or inches. Feet are represented by a single quote and inches by a double quote. Under poor growing conditions plants may be slightly to significantly smaller, whereas excellent growing conditions can produce larger more vigorous plants.
USDA Cold Hardiness Zones:
USDA Cold Hardiness Zones were established to give gardeners, horticulturists, farmers, nurseries, and landscape architects a universal way to describe where a plant will survive with regard to average winter lows for a region. And these are averages, here in zone 8B ('A' represents the colder half of a zone and 'B' represents the warmer half of the zone and they are separated by about 5oF) we have seen single digits but that is the exception but should be noted by the daring gardener. Each zone is separated by 10oF and the map was updated in 2012. Our zones do not always agree but we try to use our own experience as to what can be depended on to return or have known reputable gardens and or horticulturists to reliably grow that plant in zones that are usually colder but sometimes warmer than what other resources have available. For more on stretching your cold hardiness zones see the ""Growing on the Edge Growing Guide". If you do not know your zone you can find it by clicking on the "USDA Cold Hardiness Zones" link here or above.
Outdoor Light: Light shade, Part shade, AM sun, Part sun, *Full sun
Full Sun - 8 hours or more of direct sunlight; Partial Sun or Partial Shade - 4-6 hours of direct sunlight; AM Sun or Morning Sun or Cool Sunlight - cool sunlight but usually in the shade during the heat of the day; Light Shade - Bright indirect sunlight for much of the day; Filtered Shade - may receive some amount of direct moving sunlight like through trees but usually not for any extended period especially during the heat of the day; Shade - no or very little direct sunlight, especially not during the heat of the day.
pH Range: Acidic, Mildly Acidic, Neutral, Mildly Alkaline
Acidic or Strongly Acidic - pH less than 5.5; Mildly Acidic - pH 5.6-6.5; Neutral - pH 6.6-7.3; Mildly Alkaline - pH 7.4-8.4; Alkaline or Strongly Alkaline pH higher than 8.4. Acid loving plants that are grown under alkaline conditions often exhibit nutrient deficiencies since the roots are not able to draw some types of minerals from the soil. Gardenias, for instance, may need to be sprayed with chelated iron. Most plants that are native to alkaline soils can be grown in neutral to mildly acidic soils successfully, although the opposite generally is not true.
Soil & Moisture: Moist, but not wet, moderately fertile, humus rich, well-drained soils.
These are the basic soil types and moisture levels where this plant will survive, not necessarily thrive. Drought resistant plants will need to be well-established, usually 2-3 years at a minimum, in the garden or landscape before they are able to withstand lengthy periods (weeks or months) without supplemental water. Most plants will grow and flower and or fruit best where they have ample moisture and nutrients available during the growing season. With that said, many plants, like prairie natives, are quite adaptable to soil types and can thrive in heavy clay as easily as a loose sandy loam.
Do you know the many benefits of a proper organic mulch? Click here to learn more.
A breathable organic mulch is not only aesthetically pleasing (looks nice) but can:
- Help to improve soil organic matter as it breaks down.
- Provide shade for the soil to help reduce moisture loss and prevent weed seed germination.
- Provide soil microbes, mycorrhizae (beneficial fungi), earthworms,and even nematode predators the necessary organic matter and ecosystem to thrive while their actions aid in improving soil tilth and or friability (think of this as the ease with which roots are able to penetrate the soil).
- Provide insulation to protect the crowns of tender perennials and die-back perennials giving gardeners up to an extra half a zone of winter warmth allowing us to grow that which we normally could not.
- Provide soil temperature moderation preventing premature soil warming in winter and providing a cooler root zone in summer.
- So which mulch is our favorite? Our preferred mulch is Longleaf Pine Straw which has: a natural weed preventative for the first year after it is applied; it is sustainably harvested; and it provides protection from soil erosion and doesn't float away, and yet is still both insulative and breathable; while Longleaf Pine Straw appears to last the longest in the garden and landscape in our opinion as compared to Loblolly.
Salt Tolerance: Moderate soil and aerosol salt tolerance
The salt tolerance of plants is a relative description of how tolerant they are to windborne or aerosol and soil borne salt levels. Many plants can tolerate seaside and other coastal habitats or roadsides where deicing has occurred wonderfully while others may die or can simply survive and suffer along. If this does not say specifically that a plant is resistant to windborne or aerosol salts then we simply do not have that data available at this time.
Deer Resistance: Sometimes BotheredDeer resistance is relative to how hungry the deer (or other herbivores) are, what food is readily available in their natural habitat, and how tasty a particular plant is. Few plants are truly completely 100% resistant to being browsed by hungry deer and other herbivores. Please realize that this is just a guide based on our experience and research but some plants may never ever be bothered.
Native To / Origin: US Gardens - introduced by Dr. Michael Dirr, 1996, from the garden of Coach Vincent J. Dooley
If the plant is a true species and not a hybrid or cultivar this shows where it is normally found naturally. There may be some variation in species that are seed grown, which many of our 'species plants' often are, in order to help maintain genetic diversity. If the plant is a "cultivar" (CULTIvated VARiety) and if the data is available, it shows who developed, discovered it, hybridized it, and introduced it as well as the year it was introduced. With cultivars you will also typically see the cultivar name in quotes at the end of the botanical or scientific name. The great majority of cultivars are clonally propagated from division, cuttings, and tissue culture so that they remain true to type so have the same desirable traits as the parent such as growth habit, flower, fruit, or foliage form. With forms (form or forma), varieties (var.), and subforms (subf.) you will see these abbreviations usually between two lower case words at the end of the botanical name. They may be propagated via division or cuttings but can also be grown from seed depending on the plant and what is required to maintain them true to type. Plants that have PPAF(Plant Patent Applied For) or PP followed by a set of numbers, are illegal to propagate clonally for commercial purposes without the implicit permission of the patent holder. Some plants may have the trademark symbol (™) or copyright (©) in the name. These plants may not be clonally propagated and resold under that name without implicit permission from the copyright or trademark holder. Plants may be both patented and trademarked.
This plant may be toxic to humans and/or animals, click here for details
Please be advised that humans and/or animals may have allergic reactions if part(s) of this plant are consumed or by coming into contact with sap from bruised or broken plant parts: Flowers, Buds - Highly Toxic if Ingested, Sap - Eye Irritation and/or Dermatitis
Container Plant Growing Guide - includes uppotting, repotting, potting soil selection, proper watering techniques for containers, what does brown or yellow foliage and green soil indicate, and more
See our Planting A New Plant In the Garden or Landscape, How To, and General Growing Guide for basic planting, initial watering and estabishment watering in instructions
The information listed above that has a black arrow symbol, ‣, before the property name is expandable (just click on it anywhere) and it will contain additional details and a more in-depth description of the terms that we use in this plant's description. This information is based on our years of experience both gardening and growing plants, input from other horticulturists, nursery people, gardeners, and research. If you feel we are missing important information about a plant please feel free to share it with us so that we can pass it on.