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HORT 217
Plant Size Group Designations
In the plant groupings lists available in PDF format, you will see a number between the latin binomial and the common name that represents the plant size group. This number is provided as a study option that may help you remember the approximate mature size of each woody landscape plant. The table below explains how the size group number relates to plant height. You will not be required to know these numbers for exams.
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Height |
Height |
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Size Group Number |
Meters |
Approx. Feet |
Human Scale |
Description |
1 |
supported |
supported |
supported |
climber |
2 |
up to 0.5 |
to 1.5 |
ankle height |
groundcover |
3 |
0.5-1 |
1.5-3 |
knee height |
dwarf shrub |
4 |
1-2 |
3-6.5 |
chest height |
small shrub |
5 |
2-4 |
6.5-13 |
overhead |
medium shrub |
6 |
4-8 |
13-26 |
overhead |
large shrub / small tree |
7 |
8-16 |
26-52 |
overhead |
medium tree |
8 |
16+ |
52+ |
overhead |
large tree |
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Dr.
Matthew A. Jenks
Department of Horticulture & Landscape Architecture
Horticulture Building, Room 314
Purdue University
West Lafayette, IN 47907-2010
Phone: 765-494-1332
Email: jenksm@purdue.edu
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