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21
Annuals
1
Architecture, Domestic -- Pennsylvania -- Philadelphia
12
Bamboo
2
Bees
37
Books
27
Bulbs
15
Cactus
34
Cherry trees
9
Children
33
City gardening
35
Community gardening
15
Compost
42
Container gardening
4
Deer
1
Edible plants
40
Education
8
Fertilizer
34
Flowers
1
Food -- Preservation
8
Fruit gardening
38
Fruit trees
14
Fungi
16
Garden and landscape history
7
Garden centers
2
Garden ornaments
13
Gardening to attract wildlife
1
Gardens -- History -- 19th century
1
Gardens -- History -- 20th century
15
Gardens -- Philadelphia region
6
Greenhouses
19
Ground cover plants
18
Hardiness
7
Heirloom varieties (Plants)
1
Herbalism
5
Herbicides
11
Herbs
2
Horticulturists -- United States -- Biography
81
Houseplants
28
Hydrangeas
8
Landscape design
18
Landscape plants
23
Lawns--Care and maintenance
18
Mid-Atlantic gardening
15
Mulch
26
Native plants
10
Nurseries (Horticulture)
5
Nurseries (Horticulture) -- Pennsylvania -- Philadelphia -- History
14
Orchids
8
Organic gardening
16
Ornamental plants
8
Overwinter
21
Pennsylvania Horticultural Society -- General
35
Pennsylvania Horticultural Society history
42
Perennials
102
Pests and diseases
12
PHS Gold Medal Plants
3
PHS Green City Teachers
25
PHS McLean Library
8
PHS McLean Library Subject Guides
2
PHS Meadowbrook Farm
19
PHS Membership
6
PHS Philadelphia Flower Show -- General
87
PHS Philadelphia Flower Show -- History
2
PHS Philadelphia Flower Show -- Shopping
1
PHS Philadelphia Flower Show -- Volunteering
15
PHS Philadelphia LandCare Program
6
PHS Pop Up Gardens
4
PHS Sponsorship Opportunities
24
PHS Tree Tenders
68
Plant Identification
14
Plant propagation
122
Plant recommendations
51
Plant sources
10
Poisonous plants
41
Pruning
5
Raised beds
3
Rock gardens
36
Roses
4
School gardens
24
Seeds
19
Shopping
101
Shrubs
27
Soils
18
Stormwater management
24
Street trees
18
Succulent plants
2
Terrariums
1
Topiary work
4
Travel
136
Tree care
166
Trees
13
Trees -- Identification
7
Tropical plants
3
Urban agriculture
18
Vacant land
62
Vegetable gardening
31
Vines and climbers
1
Volunteering
1
Weather
8
Weddings
21
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