As hay is not grown in a laboratory setting and is harvested with machinery, rabbit owners may often find random dried plants in their purchases of hay, even with the best quality control. In general, picking out these unrecognized plants and feeding the rest of the hay is okay. The following are some pictures of plants that have been observed to be included in packaged and bales of hay.

Dried dockDried dock (Rumex spp.) [source]
Dried mulleinDried mullein (Verbascum thapsus) [source]
Dried mallowDried mallow (Malva spp.) [source]
Dried pigweed/amaranthDried pigweed/amaranth (Amaranthus spp.) [source]
Dried horsenettle berriesDried horsenettle berries (Solanum carolinense) [source]
Dried barnyard grassDried barnyard grass (Echinochloa crus-galli) [source]
Dried foxtailDried foxtail (Setaria viridis) [source]
Dried field pennycressDried field pennycress (Thlaspi arvense) [source]
Dried common milkweedDried common milkweed (Asclepias syriaca) [source]
Dried hoary alyssumDried hoary alyssum (Berteroa incana) [source]
Dried purple thistleDried purple thistle (Cirsium horridulum) [source]
Dried sow thistleDried sow thistle (Sonchus spp.) [source]
Dried horsetailDried horsetail (Equisetum arvense) [source]
Dried weeds found in hay
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