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Gardening Answers Knowledgebase

Plant Answer Line Question

Keywords: Plant inspection, Plant quarantine

I will be transporting plants from Oregon to Washington to sell to the public. Are there any restrictions, such as quarantines, that are important to know about?


You should contact the U.S. Department of Agriculture's Animal and Plant Health Inspection Service (APHIS).

The Oregon Department of Agriculture has information on plant exports, quarantines, and permits. There are also Washington State codes about the transportation of plants that can be found in Chapter 17.24 RCW, Insect Pests and Plant Diseases. You can then click on specific sections, such as 17.24.081, Prohibited acts.

Additionally, this site makes reference to the Washington Administrative Code and includes information about standards that apply to plants and pests. See Chapter 16-402 WAC, Plant Pest Infestations and Plant Labeling standards.

You can also click on the embedded links to look at the specific standards.

Date 2017-04-14
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Plant Answer Line Question

Keywords: Cytisus scoparius, Noxious weeds--Washington, Plant quarantine, Invasive plants

Is it safe to plant Cytisus scoparius 'Moonlight' here on Whidbey Island? I know that Scotch broom is thought to be invasive, but I wonder if maybe this variety is less of a problem.


Some sources (such as the State of Oregon's noxious weed control board) have said that "sterile cultivars" of Cytisus scoparius are exempt from regulations governing noxious weeds. However, the Center for Urban Horticulture's Professor Sarah Reichard, an expert on invasive species, says the following:

"The 'sterile cultivar' issue is huge worldwide. The reality is that sterile cultivars depend on the type of sterility: there are many reasons a plant might be sterile. Only a few of them can be considered to be stable under varying environmental conditions.

Regardless of what is done in Oregon, in Washington it is illegal to sell or grow any cultivars of Cytisus scoparius. Moonlight is less aggressive, but I have definitely seen it seeding out. But it does not matter how aggressive it is: it is still on the quarantine list in this state because that is the way the state law is worded. Island County may not have it on their high profile noxious weed list because it is only a B non-designate there because it is widespread. But our noxious weed (control) and our quarantine lists are two different things in this state and it is quarantined here."

For future reference, here are links to Washington State Plant Quarantine and Noxious Weed lists.

Date 2017-08-15
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May 23 2018 14:32:42