Repeat this treatment three days later if salt levels are still high. Alkaline soil is common in Minnesota. For evergreens, such as cedars (Juniperus virginiana), I would choose the same potting mix blend but opt for a fertilizer formulated for evergreens and hollies because these shrubs often like soil that is a bit more acidic (5-7 pH), though some are quite soil adaptable. Leaching the soil with thorough irrigation after salt exposure. Easily grown in average, dry to medium, well-drained soils in full sun. Evergreens make up an essential component of the landscape, providing winter interest and, in many cases, spring blooms. The flowers are sweetly scented and there are several attractive cultivars to grow, including ‘Albostriata’ and ‘Hardwick Hall’. However, when I see how well so many plants look growing on clay my attitude changes. If the soil is quite thin, improve before planting by incorporating lots of organic matter such as leaf mould and well-rotted manure. and arborvitae (Thuja occidentalis). Our native honeysuckle, Lonicera periclymenum, does well in a variety of settings, and there are plenty of cultivars to grow, including ‘Graham Thomas’ and ‘Serotina’. Sorbus aria can reach a large size and the cultivar ‘Lutescens’ is more compact. You can neutralize this “lime” or “chalk” soil somewhat with copious amounts of peat moss or chemicals. Toronto Master Gardeners has a gardening guide on its site which gives instructions on choosing, planting and maintaining evergreens suitable for hedging. He is currently pursuing an accelerated master's degree in applied geography at the University of North Carolina at Greensboro. Compiled by Esther Filson, Washington County Mas-ter Gardener. Plants for Alkaline Soils The variety ‘Hibernia’ is one of the best trees for limestone soils. I feel rather smug about my sandy soil which is light, easy to dig and drains freely. Flush salt through the soil by applying 2 inches of water over a 2-3 hour period, stopping if runoff occurs. Select from cherry, apple, pear and plum bare-root trees. Mulch generously in spring with well-rotted organic matter, coarse grit or bark – around a barrowload per square metre. (If your pin oak gets chlorosis, here's your answer.) ), magnolia trees (Magnolia spp.) Camellia sasanqua: Zones 7 –8; moist but well-drained, humus rich, acidic soil; partial shade; established plants will tolerate full sun, shelter from cold, dry wind. The best time to fertilize your evergreens is before new growth expands, around early April in Minnesota, up to about mid-July. Grow them in full sun to get the best from them. If you’re looking for a ground cover plant for alkaline soils, consider lily of the valley. Floral & Hardy’s Top Ten Shrubs for Alkaline Soils: Arbutus unedo Generally, evergreens grow better when soil pH is acidic; many nutrients may be unavailable to the plant when soil is too alkaline. These nutrients tend to acidify the soil. Since rhododendrons have shallow roots, the bed only needs to be about 12 inches high. Like their coniferous cousins, these plants also prefer growing in woodland habitats with somewhat acidic soil. The key to gardening in these often drought-prone and nutrient poor soils is to select from the wide range of colourful plants that thrive in dry summers, need sharp drainage and moderate to low fertility. Peat moss, compost and manure are organic options you can use to lower pH. and cypress (Cupressus spp.). East (251) North (178) South (259) West (348) How much sun. In the rare case your soil is extremely acidic, pH can be brought up to the desired range using lime products at rates according to your soil test results or local extension recommendation. Delightful, delicate foliage and double lilac flowers team together for an ethereal addition to your garden. You have to reapply it every month or two during the growing season and water it in well. Alkaline soils will be PH7.1 or above. As with nearly all soils, it's a great idea to add organic matter, such as compost and well-rotted manure, to alkaline soils. Give your lilacs full sun, and they’ll reward you with fragrant spring flowers you can snip for bouquets or leave on the plants to attract beautiful butterflies. Common broad-leaved evergreens include many types of azalea and rhododendron, magnolia, camellia and holly (Ilex spp.). What is soil pH? This reblooming lilac, 'Bloomerang Purple', ( Syringa) likes fertile soils, good drainage, and a pH that ranges from neutral to alkaline. Two major categories of these include broad-leaved and coniferous evergreens. 75 Alkaline Friendly Plants. Generally, this does not pose a huge concern. 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