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When planting plants how can you figure out how big they are going to get?

It never fails. When planting my perennial garden, I always end up sticking a tall plant in front of a lower growing one. Could you help me figure out how big my plants will get?
Submitted by BHGPhotoContest

Unless your perennial border has a formal design, an occasional "oops"---a taller plant in front of a shorter one---can add drama and interest to your flower garden. Some gardeners intentionally plant tall "see-through" plants with airy flower stems, but low-growing foliage in front of shorter plants. However, in most cases, it's understandable that you wouldn't want to hide any of the beauties in your garden. Use the following list as a guide.

Low-for front border (to 1 1/2 feet) Bethlehem sage Pulmonaria saccharata 3-8 Bloody cranesbill Geranium sanguineum 4-8 Carpathian bellflower Campanula carpatica 2-7 Catmint Nepeta x faassenii 3-8 Chrysanthemum Chrysanthemum morifolium 4-9 Coral bells Heuchera sanguinea 3-8 Cushion spurge Euphorbia polychroma 4-9 Heart-leaf bergenia Bergenia cordifolia 3-8 Lady's mantle Alchemilla mollis 3-7 Lamb's-ears Stachys byzantina 3-8 Lavender cotton Santolina chamaecyparissus 6-9 Lenten rose Helleborus orientalis 4-9 Ozark sundrops Oenothera macrocarpa 4-8 Pinks Dianthus spp. 4-8 Sea thrift Armeria maritima 3-9 Threadleaf coreopsis Coreopsis verticillata 4-9  Medium-for middle border (to 4 feet) Astilbe Astilbe x arendsii 3-8 Baby's breath Gypsophila paniculata 3-8 Balloon flower Platycodon grandiflorus 3-8 Bearded iris Iris bearded hybrids 3-9 Beardlip penstemon Penstemon barbatus 4-9 Bee balm, Oswego tea Monarda didyma 3-9 Bleeding heart Dicentra spectabilis 3-9 Blue false indigo Baptisia australis 3-9 Butterfly weed Asclepias tuberosa 4-9 Cardinal flower Lobelia cardinalis 3-9 Columbine meadow rue Thalictrum aquilegifolium 3-9 Daylily Hemerocallis 3-10 Featherleaf rodgersia Rodgersia pinnata 4-7 Fern-leaf yarrow Achillea filipendulina 3-9 Frikart's aster Aster x frikartii 5-8 Garden phlox Phlox paniculata 3-8 Helen's flower Helenium autumnale 3-8 Hosta Hosta 3-8 Obedient plant Physostegia virginiana 3-8 Oriental poppy Papaver orientale 3-7 Peony Paeonia spp. 3-8 Purple coneflower Echinacea purpurea 3-9 Salvia Salvia spp. 4-9 Shasta daisy Leucanthemum x superbum 4-8 Siberian iris Iris sibirica 3-9 Speedwell Veronica spp. 3-8 Spiderwort Tradescantia virginiana 4-9 Spike gayfeather Liatris spicata 3-9 Stoke's aster Stokesia laevis 5-9 Toad lily Tricyrtis hirta 5-9 Tall-for back border (over 4 feet) False sunflower Heliopsis helianthoides 3-9 Goatsbeard Aruncus dioicus 3-7 Hybrid delphinium Delphinium 2-7 Joe-Pye weed Eupatorium purpureum 4-9 Lily Lilium spp. 3-8 Monkshood cultivars Aconitum x cammarum 3-7 New England aster Aster novae-angliae 4-8 New York aster Aster novi-belgii 3-8 Plume poppy Macleaya cordata 4-9 Queen-of-the-prairie Filipendula rubra 3-9 Red hot poker Kniphofia uvaria 5-9 Russian sage Perovskia atriplicifolia 3-9 Snakeroot Cimicifuga racemosa 3-8 White boltonia Boltonia asteroides latisquama 4-9

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