Many garden jokes make fun of hydrangeas. Perhaps familiarity breeds contempt in this situation. Although they are everywhere, they are well-liked for a reason: they are simple to grow, floriferous, and reliable.
The mop-heads, which have big, nearly spherical heads made of sterile florets (yep, it’s all for show), and lace-caps, which have circles of tiny blossoms surrounded by sterile flowers whose purpose is to attract pollinating insects, serve as typical examples of them. They are primarily pink or blue, and the predominant colour depends on the soil’s alkalinity: pink predominates in lime soils while blue predominates in acidic soils.
But disregard them; white ones are the best. If you choose certain varieties of the most spectacular species, you’ll not only be introducing fascinating shrubs with enormous presence, but they also look perfect in any planting scheme. They offer height to mixed borders or autumn depth to plants in gloomy areas with the least amount of maintenance.
All varieties of hydrangeas favour humus-rich, moisture-retentive soil. Before planting, provide their new home with a lot of well-rotted organic material to increase their possibilities. If you can’t get your hands on such treasures—homemade compost or old muck are both excellent, leaf mould also helps—there are lots of proprietary organic goods available. One of the appeals of hydrangeas is that their flowers remain attractive for months before gradually fading, and their demise is elegant. Then, during pruning, they can be separated from the plant and enjoyed for several more months indoors.
The excellent white mop-head H. macrophylla ‘Soeur Therese’, which thrives in partial shade, is grown by savvy gardeners. H. paniculata produces huge terminal panicles, cone-shaped clusters of tiny, fertile flowers, and clearly discernible sterile florets, as its name implies. White cultivars with hefty heads of pure white flowers, like H. paniculata ‘Unique,’ are magnificent. The flowers of H. paniculata ‘Green Spire’ are peculiar but attractive, always remaining on the green side of white. Comparable in size and with the added benefit of deep fall colour, H. quercifolia bears similar but less flamboyant flowers, and H. arborescens ‘Annabelle’ smothers itself in pure white pompoms. Peerless.
How do I maintain the colour of my white hydrangea?
A lot of people are drawn to hydrangeas because of their vivid and exquisite colours. Several of them even alter their colour! It’s no surprise that they’re so well-liked with their enormous blossoms and large, glossy green leaves. Don’t let that deceive you, though; adding a stylish white Hydrangea plant to your yard is just as attractive.
Focus on maintaining the health of your white hydrangeas by giving them the right amount of water, light, and fertiliser. If your white Hydrangea is becoming blue or pink, you definitely don’t have a true white variety because white Hydrangeas don’t change colour with soil pH like blue and pink blooms do.
Are ericaceous compostes necessary for white hydrangeas?
For hydrangeas to change from pink to blue, the soil must be acidic and contain salts of either aluminium or iron.
We all learned in chemistry classes in school that distilled water has a neutral pH of 7. However, in horticulture, a neutral pH is typically categorised as 6.5. Any soil with a pH below 6.5 is considered acidic, and any soil with a pH above 6.5 is considered alkaline. A pH testing kit can be used to check the pH of your soil, and Greenshutters Nurseries & Garden Centre has these on hand. The inexpensive pH metres that are available are often not precise, so I do not advise using them. Often, seeing surrounding gardens and the local plant life is a simpler approach. It’s likely that your soil is acidic if nearby Rhododendrons, Camellias, and Pieris are flourishing in the soil.
Peaty or sandy soils are typical of acidic soils. Clay soils are typically not highly acidic. Chalky soils have a high pH. By incorporating Irish moss peat or ericaceous compost, you can increase the acidity of your soil. Ericaceous compost has an acidic pH range of roughly 5.0 to 5.5, while regular multifunctional compost has a pH range of 6.0 to 6.5.
Irish moss peat is particularly useful for mulching since it has a pH of about 4.0, which is much too acidic for most plants to thrive in. However, when combined with neutral or alkaline soil, it lowers the pH of the soil. Once a year, mulch with Irish moss peat and let the worms to work the peat into the soil to maintain the acidity of the soil around a plant.
As an alternative, hydrangeas can be grown in containers. Although hydrangeas can thrive in both multifunctional and ericaceous compost, it is recommended to plant them in the latter if you want them to turn blue.
If your soil is deficient in aluminium or iron salts naturally, you can easily increase them by putting Hydrangea Colorant into the soil. People claim that adding rusty nails to the soil or compost will turn hydrangeas blue; however, as I have never tried it, I am unable to confirm if this is true or false. On the other hand, Hydrangea Colorant is a combination of Iron Salts and Aluminium Sulphate. When potting or planting, it can be added to the soil. For established plants, you can also dissolve the Hydrangea Colorant in water and give your hydrangeas a weekly drink during the growing season (March to September). Your light pink kinds will become blue if you do this, while your dark pink varieties will turn mauve-blue.
Grow your hydrangea in neutral or alkaline soil, though, if you want it to stay pink.
The greatest places to cultivate white hydrangeas?
White hydrangeas come in a variety of varieties, each of which need particular care and planting conditions to thrive. The four most typical types are as follows:
Smooth (H. arborescens): The most often used cultivar is “Annabelle.” While southern gardeners should grow smooth hydrangeas in moderate shade, full light is where they flower at their best.
Bigleaf (H. macrophylla): Everyone loves bigleaf hydrangeas, but not everyone can grow them. They are the traditional florist varieties of hydrangea. Bigleaf plants thrive in moist, well-drained soils and partial shade. The majority can survive in Zones 5 or 4, depending on winter protection.
Cone-shaped flowers are produced by panicle hydrangeas (H. paniculata), which are hardy and simple to grow. They thrive in all but the coldest climes and appreciate full sun (Zone 3). Panicles normally bloom in the middle of summer, later than other types. Depending on the variety, heights can range from three to ten feet.
The oakleaf plant (H. quercifolia) has oak-shaped leaves that change into striking hues of burgundy, rust, or orange in the fall. As the weather cools, the white flower heads typically turn pink or tan. This native species’ cultivars, which are typically hardy to Zone 5, thrive on dry soils and full sun to moderate shade.