Garden Expert: Get Planting
The importance of planting the right tree in the right place
A new gardening season is ahead of us: a fresh chapter in the book of life with nature. I recommend that we make the best of it and plant some trees. It is important to plant the right tree in the right place. Here are some considerations when planting trees and my top recommendations:
1 SMALL TREES THAT FLOWER AND FRUIT
Small lots and densely populated urban areas are no longer suitable places for large-growing shade trees. Here are my favourite trees that will grow no higher than seven metres and will flower and/or fruit:
DWARF APPLE TREES There are dozens of varieties of dwarf apple trees available. My favourite apple for vigour and strength is Cortland. The tree grows relatively quickly and produces lots of great mid-season eating apples.
PEARS The lowest-maintenance fruit tree out there. No need to look for ‘dwarf’ pears as a standard pear generally grows to about six or seven metres, given enough time.
CHERRIES Sour or sweet, cherries grow reliably in Toronto (zone 6). ‘Stella’ is a great choice for a sweet cherry as no partner is required to cross-pollinate, otherwise you will need two. Sour cherries are self-fruitful.
CRAB APPLE An unfortunate name for a versatile and winterhardy tree. ‘Dolgo’ produces red fruit in the fall that is suitable for canning. Otherwise, plant crab apples for their spring colour and small- to medium-stature.
2 SHADE: WHAT KIND?
For filtered shade, which will provide the cooling effect of a deciduous tree (one that drops its leaves each fall) without cutting out all of the sunshine, look for these winners:
LOCUST ‘Shademaster’ is hardy to zone 4 (Ottawa). This variety features horizontal branching, while ‘Skyline’ Honey locust produces a more upright, vase-shaped structure. Both are disease- and insectresistant and grow to a medium height of about 12 to 15 metres.
BIRCH A long-time favourite. They produce filtered shade and the lovely white bark stands out in the winter garden. Look for native birch, like Paper Birch [Betula papyrifera], as they are resistant to the dreaded bronze birch borer, which has wreaked havoc with the European birch species in recent years.
3 EARLY SHADE/DENSE SHADE
Not all deciduous trees leaf out at the same time. Birch, willow and maples are among the earliest (early May), and Catalpa and Rose of Sharon are among the latest (mid-June). For early leaf cover that lasts late into the season, consider:
MAPLE [ACER] Native sugar maples leaf out in early May and drop leaves in mid-to late October. Norway Maple, while deemed an invasive species, does leaf out marginally earlier and drops in early November. Both produce bright yellow colour come fall.
CHESTNUT [AESCULUS] A member of the orchid family. Have a close look at the flowers come early June and note that the upright panicle or ‘candelabra’ features dozens of gorgeous orchid-like flowerets. I love Chestnut trees but they are susceptible to blight, which may not kill them but creates brown-hued leaves that are not very attractive come late summer.
4 MY FAVOURITE ALL-ROUND TREES
There are some trees that do not fit neatly into a single classification but are amazing for their own reasons. Here are my favourites:
LINDEN [TILIA CORDATA] related to native Basswood. Provide lovely, cool, dense shade. Produce fragrant (green) flowers that attract pollinators (and make great tea). Lindens are winter hardy and disease-resistant. They feature a formal ace-shaped structure that fits neatly into relatively tight spaces. There is a promenade of Lindens on the east side of the Royal Conservatory, and west side of the Art Gallery of Ontario, that will sell you on this species, if nothing else will.
JAPANESE TREE LILAC ‘IVORY SILK’ [SYRINGA RETICULATA ‘IVORY SILK’] Ivory Silk is an oval- shaped, compact tree (great for smaller lots and spaces) that blooms reliably each Father’s Day in mid-June. ‘Ivory Silk’ is winter hardy and resistant to disease and insect problems.
OAK Any oak is a great oak, but I like native Red Oak [Quercus rubra] and Pin Oak [Quercus palustris] best. Red Oak (so named as the wood is red) grows into a large 18-metre giant. There are heritage Red Oaks in High Park that are amazing. Pin Oak is narrower and more suitable for the tight spaces of urban life.
Mark Cullen is an expert gardener, member of the Order of Canada, author and broadcaster. Get his free monthly newsletter at markcullen.com. Look for his new best seller, The New Canadian Garden published by Dundurn Press. Follow him on Twitter @MarkCullen4 and Facebook. markcullen.com