Answer: There are many, many annuals and perennials you can grow in zone 5. Here's a short list:
Alumroot (Heuchera); Aster (Aster sp.); Astilbe (Astilbe sp.); Baby's breath (Gypsophila paniculata); Balloon flower (Platycodon grandiflorus) ;Barrenwort (Epimedium); Basket-of-gold (Aurinia saxatilis); Beardtongue (Penstemon); Bear's breeches (Acanthus sp.); Bee balm (Monarda); Bellflower (Campanula sp.);
Bergenia (Bergenia sp.); Black-eyed Susan (Rudbeckia fulgida); Blanket flower (Gaillardia x grandiflora); Bleeding heart (Dicentra); Bluestar (Amsonia tabernaemontana) ;Boltonia (Boltonia asteroides) ;Brunnera (Brunnera macrophylla) ;
Bugbane (Cimicifuga) ;Bugleweed (Ajuga) ;Bugloss (Anchusa); Campion (Lychnis) ;
Candytuft (Iberis) ;Cardinal flower (Lobelia); Carnation (Dianthus) ;Chamomile (Anthemis); Chrysanthemum (Chrysanthemum) ;Cinquefoil (Potentilla nepalensis.
Some of the prettiest patio trees are those that flower in the spring. I don't think you'll find a tree tht will remain only 5' tall, so you may want to reconsider and plant a shrub instead. But if you can give it a little more room you can try one of these:
Thisvariety reaches only 8-10?tall and forms a dense head. Bright coral buds open to
double pink flowers. Small bronzy orange fruit. Deciduous, full sun. Zone 5.
Morus alba ?Contorted?Contorted Mulberry. The curious contorted branches of this mulberry makes it a specimen plant in a container. A small tree growing 6=8? tall. Fruitless. Full sun.
Peach ?Empress? or ?Golden Glory?These are two genetic dwarf varieties of peaches that grow only 5? tall. A beautiful container tree with bright pink flowers in
early spring. Both varieties produce sweet juicy fruit in September.
Cornus alba or stolonifera cultivars Red twig dogwoods. These shrubs can be easily trained into a tree form. They can reach 8-10? tall/wide. Beautiful colored twigs in winter. Sun or part shade.
Best wishes with your garden!
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