Terreno alcalino e piante a cui non importa l’alcalinità

I terreni con un livello di pH superiore a 7 sono detti “alcalini”. Tali terreni sono adatti per la coltivazione di piante che prosperano in un terreno “dolce”, al contrario di un terreno “aspro” o acido. Se è necessario aumentare il pH del terreno (il che significa che il terreno non è sufficientemente alcalino), applicare la calce da giardino. Se, d’altra parte, il tuo terreno ha troppa alcalinità, puoi abbassare il pH applicando un fertilizzante che contiene zolfo/ammonio-N (potresti vedere “Solfato di ammonio” sull’etichetta). Non lasciarti spaventare dal gergo della chimica: quando sei al garden center, cerca un fertilizzante destinato alle piante che amano gli acidi (avrà gli ingredienti che stai cercando).
We are breaking this list into sub-lists: perennials (including mentions of a  bulb plant  and a couple of types of  ornamental grasses ), vines, shrubs, trees, and annuals. We will begin with perennials, which are the first plants that people think of when the subject of flower gardens comes up. By paying careful attention to sequence of bloom in your planning, you can experience many months of magnificent floral color in your yard by growing perennial flowers:
Anchusa azurea
Sedum ‘Autumn Joy’
Bearded iris (Iris x germanica)
Black-eyed Susans (Rudbeckia hirta)
Candytuft (Iberis sempervirens)
Catmint (Nepeta × faassenii)
Centaurea montana
Columbine (Aquilegia spp.)
Daylilies (Hemerocallis spp.)
Delphinium
Easter lilies  (Lilium longiflorum, a bulb plant)
Festuca glauca ‘Elijah Blue’ (an ornamental grass)
Foxglove (Digitalis spp.)
Goldenrod (Solidago spp.)
Hens and chicks (Sempervivum tectorum)
Hosta
Jacob’s ladder (Polemonium caeruleum)
Lavender (Lavandula spp.)
Lenten rose (Helleborus orientalis)
Maiden grass  (Miscanthus sinensis, an ornamental grass)
Maltese cross (Lychnis chalcedonica)
Meadow rue ( Thalictrum aquilegifolium)
Mums (Chrysanthemum spp.)
Pasque flower (Pulsatilla vulgaris)
Red hot poker (Kniphofia)
Reticulated iris (Iris reticulata)
Salvia
Shasta daisy (Leucanthemum x superbum ‘Becky’)
Siberian bugloss (Brunnera macrophylla)
Woodland phlox (Phlox divaricata)
Yarrow (Achillea millefolium)
Vines, and particularly flowering vines , are remarkably useful plants in a landscape. The one drawback they have, as a class, is that many of them are aggressive. So if you are someone who, in your plant selection , strives to obtain plants that are compatible with low-maintenance landscaping , make it a point to research the qualities of a vine carefully before purchasing it:
Boston ivy (Parthenocissus tricuspidata)
Clematis
Kiwi (Actinidia kolomikta)
Vinca minor
Virginia creeper (Parthenocissus quinquefolia)
Winter jasmine (Jasminum nudiflorum)
Shrubs have been dubbed the “backbone” of a landscape because they furnish it with valuable structure. Select a variety of flowering shrubs if you wish to optimize color in your spring and summer landscape; some are also good shrubs for fall color . But also remember that the value of evergreen shrubs soars in winter when all of your other plants have dropped their leaves. When it comes to alkaline soil vs. acidic soil, Hydrangea presents a special case.  You can change a hydrangea’s color by changing the soil pH.
Some types of shrubs that will grow in alkaline soils are:
Arborvitae (Thuja spp.)
Buxus sempervirens ‘Suffruticosa’
Contorted filbert (Corylus avellana)
Cotoneaster horizontalis
Deutzia
Euonymus fortunei ‘Emerald Gaiety’
False cypress (Chamaecyparis)
Forsythia
Golden privet (L. ovalifolium ‘Aureum’)
Lilac bushes (Syringa spp.)
Rose of Sharon bushes (Hibiscus syriacus)
Smooth sumac ( Rhus glabra)
Spiraea japonica
“Tree” peonies (Paeonia suffruticosa)
Viburnum  
Weigela florida
Yew bushes (Taxus spp.)
Yucca filamentosa
Because of their size (and because of their corresponding cost and impact on your property), you have to pay special attention to the plant-selection process when choosing a tree. But if you get it right, you can end up with a plant that you will later deem indispensable to your landscape. Some are towering giants that can cast shade over a large portion of your yard, while others are much shorter and serve effectively as shade trees for patios. Still others are considered dwarf trees and function more like shrubs in your landscaping:
Common (or “European”) beech (Fagus sylvatica)
European ash (Fraxinus excelsior)
Ginkgo biloba
Horse chestnut (Aesculus spp.)
Mugo pine (Pinus mugo)
Ornamental cherry (Prunus spp.)
Some annuals can also be grown in an alkaline soil without difficulty, including Calendula , bachelor buttons (Centaurea cyanus), and sweet alyssum (Lobularia maritima). Mix some annuals into your perennial flower borders to achieve the landscape color scheme that you are seeking.

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