Issue 88 Plants Toxic to Fish

Azalea Designing a garden around a pond or water feature involves more than using plants that thrive in those types of conditions. If you have fish in your pond, plant choices are even more important. Your fish may appreciate the shade cast from plants and trees. But if the leaves, fruit or bark of some plants containing toxic chemicals should fall into the water, they can poison the fish. For pondside plantings, here are some plants to avoid and which parts are toxic to fish:
Plant Name Toxic Parts
Azalea
Rhododendron spp.
Leaves
Black walnut
Juglans nigra
Leaves, hulls
Bleeding heart
Dicentra spp.
Leaves, roots
Caladium
Caladium spp.
All Parts
Castor bean
Ricinus communis
Seeds, leaves
Chokecherry/Cherry
Prunus spp.
All Parts
Climbing nightshade
Solanum dulcamara
All Parts
Daphne
Daphne spp.
Berries
Brugmansia
Datura spp.
Flowers, berries, seeds
Flowering tobacco
Nicotiana alata
Leaves
Foxglove
Digitalis spp.
Leaves, seeds
Holly
Ilex spp.
Berries
Horsechestnut
Aesculus spp.
Nuts, twigs
Jack-in-the-pulpit
Arisaema spp.
All Parts
Jasmine
Jasminum spp.
Berries
Juniper
Juniperus virginiana
Needles, stems, berries
Larkspur
Consolida ajacis
Foliage, seeds
Lily-of-the-valley
Convallaria majalis
All Parts
Mockorange
Philadelphus hybrids
Fruit
Monkshood
Aconitum spp.
Roots, flowers, leaves
Morning glory
Ipomoea spp.
All Parts
Peony
Paeonia spp.
All Parts
Pinks
Dianthus spp.
All Parts
Ponderosa pine
Pinus ponderosa
Sap
Red maple
Acer rubrum
Leaves
Snapdragon
Antirrhinum spp.
All Parts
Sweet pea, everlasting pea
Lathyrus spp.
Seeds, fruits
Tomato
Lycopersicon esculentum
Foliage, stems
White snakeroot
Eupatorium rugosum
All Parts
Wisteria
Wisteria spp.
All Parts
Yew
Taxus spp.
Needles, seeds