Skinny trees for tight spaces

Flowering trees
These are grown for their showy flowers and sometimes equally showy fruits.

NAME	HEIGHT/ SPREAD	SPECIAL ATTRIBUTES	ZONE
Single seed hawthorn (Crataegus monogyna ‘Stricta')	10 x 4	White flowers; red fruit; lustrous dark green foliage; susceptible to fire blight	3
Upright Siberian crabapple (Malus baccata ‘Columnaris')	9 x 2.5 to 3	White flowers; small, yellow fruit; new foliage tinged bronze, turns green	3
Madonna crabapple (M. ‘Mazam')	6 x 3	Double, white flowers from pink buds; yellow fruit; new foliage tinged bronze, turns green	4
‘Pink Spires' crabapple (M. ‘Pink Spires')	6 x 4	Pink blooms from darker buds; purple-red fruit; new foliage reddish purple, turns copper	5
‘White Candle' crabapple (M. ‘White Candle')	4.5 x 1.5	Semi-double, white flowers; red fruit; foliage dark green, persists into fall	4
‘Spire' flowering cherry (Prunus x hillieri ‘Spire')	20 x 3	Pink flowers; red fruit; orange-red foliage in fall; shiny, copper-coloured bark	5b
‘Amanogawa' Japanese flowering cherry (P. serrulata ‘Amanogawa')	8 x 3	Pink, semi-double, fragrant flowers; black fruit; bronze-red foliage in fall	6
‘Capital' callery pear (Pyrus calleryana ‘Capital')	12 x 5	White flowers; inconspicuous, pear-like fruit; copper fall foliage; resistant to fire blight	5b
Chanticleer callery pear (P. c. ‘Glen's Form')	12 x 6	White flowers; inconspicuous, pear-like fruit; red fall foliage	5b
Upright oakleaf mountain ash (Sorbus x thuringiaca ‘Fastigiata')	8 x 3	White flowers; showy red berries; dull yellow fall foliage; resistant to fire blight	5

Trees for fall colour
While some flowering trees have good fall colour, others are worth considering for their outstanding autumn colour alone, such as narrow cultivars of red and sugar maples.

NAME	HEIGHT/ SPREAD	SPECIAL ATTRIBUTES	ZONE
‘Armstrong' red maple(Acer x freemanii ‘Armstrong')	15 x 6	Fast-growing; smooth, silvery grey bark; fall foliage a good red	3
‘Karpick' red maple(A. rubrum ‘Karpick')	15 x 6	Distinctive red twigs; yellow to red fall foliage (yellow if mild autumn)	3
‘Newton Sentry' sugar maple(A. saccharum ‘Newton Sentry' syn. ‘Columnare')	10 x 2.5	Orange-yellow fall foliage; loses central leader and grows with several parallel stems	4
‘Green Column' sugar maple(A. s. ssp. nigrum ‘Green Column')	20 x 7	Orange-yellow fall foliage; keeps central leader	4
‘Temple's Upright' sugar maple (A. s. ‘Temple's Upright' a.k.a.‘Monumentale')	20 x 5	Orange-yellow fall foliage; keeps central leader	4
Princeton Sentry maidenhair tree (Ginkgo biloba ‘PNI 2720')	12 x 3	Distinctive, fan-shaped leaves; bright yellow fall foliage; male clone (no smelly fruit)	4
Upright European aspen (Populus tremula ‘Erecta')	20 x 4	Yellow fall foliage; less disease-prone than Lombardy poplar	2
‘Tower' poplar (P. x canescens ‘Tower')	20 x 4	Yellow fall foliage; almost disease-free; male clone; doesn't produce cotton	2