| http://www.w3.org/ns/prov#value | - The program also helps to prevent the spread of harmful plant pests.Plants and plant products include items such as Christmas trees, landscape trees, shrubs, nursery stock, seed, grain, grain products, lumber, veneer, tissue culture plantlets, potatoes and seed potatoes.If you???re unsure if a plant or product requires a phytosanitary or plant health certificate prior to shipping, contact our staf
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