Bulbs, Corms, Tubers, and Rhizomes: These can often only be obtained from conventional sources. These would need to be cultivated for at least one year according to CNG standards before they are sole, labeled, or represented as Certified Naturally Grown. 

Seeds, Transplants, and Perennial Stock: Generally, CNG producers must use seed that is organically grown, whether CNG, Certified Organic, or uncertified whenever they are available. But, if a producer is unable to find the variety they need in organically grown form after checking with at least three suppliers, CNG allows an exception for a farmer to use conventionally grown seed, just as long as it is not chemically treated or genetically engineered.

Pelleted seeds must not contain synthetic fungicides or germinating agents. 

Transplants must be grown without synthetic fertilizers, wetting agents, or pesticides, and with seeds that meet CNG standards. When purchasing transplants, sometimes it can be difficult to tell how transplants were grown. The best ways to ensure that transplants meet CNG requirements is growing them yourself if you are able, or communicating directly with the transplant grower about their practices. For perennials that were started conventionally, they can be considered fully CNG after 12 months under CNG management.

Learn more about seeds, transplants, and perennial stock

Potting Mix: To meet CNG standards, potting mix can’t contain synthetic ingredients such as chemical fertilizers or synthetic wetting agents. Commercial potting mixes frequently contain one or both of these, so it’s important to check the ingredient list carefully if you purchase potting mix. If you are able, making your own potting mix gives you more control over the ingredients.

ProMix is a popular brand with an organic blend that a lot of CNG growers use. If you are making the switch from conventional to organic ProMix or other potting mix, the soil should behave fairly similarly. The main difference will be in rehydration. Organic soil has a difficult time reconstituting once it dries out completely, so you'll want to just be careful not to let the soil dry out. If you've been using a mix that has a biofungicide, then the fungicide will kill off anything that grows as a result from over-watering or overly cold and damp conditions, so you will have to be careful not to overwater with an organic potting mix.

Switching to an approved potting mix will mean it takes a bit more care irrigating starts in the greenhouse, but also ensure that all the flowers are grown without synthetic chemicals!

Conventional and CNG Field Areas on the Same Farm: While most of our certified producers have their entire operation certified, there are some situations where a farmer hasn't managed to grow certain crops according to CNG standards. It is possible to exclude some crops from certification, and have other crops get CNG certified. We just ask that it be made clear which is which during marketing, and that everything is explained clearly on the farm's public profile on the CNG website.

Soil Fertility: To manage fertility on their farm, CNG farmers use management practices like cover crops and crop rotations, and organic amendments such as compost, manure, fish emulsion, soybean meal, feather and bone meal, and unprocessed minerals. Synthetic fertilizers are not allowed.

Weeds, Pests and Plant Disease: CNG encourages mechanical and cultural methods as the first line of defense against weeds, pests, and diseases. When those methods don’t solve the issue, most botanical and biological controls, such as ladybugs, BT, neem, or kayolin clay, are also allowed. (Rotenone is a notable exception; though it is an unprocessed botanical, it has been linked to Parkinson’s Disease and is not allowed). As a general rule, most OMRI-approved products meet CNG standards. No synthetic herbicides, pesticides, or fungicides are allowed.

Buffers: It is important for CNG farmers to have an adequate buffer to protect their fields from potential sources of contamination. The appropriate size of the buffer depends on the context, including factors like prevailing wind patterns, the elevation and slope of the land, and what the neighboring land uses are. Typically, we look for a minimum distance of 20 feet to crops like a fertilized hayfield, field corn and soybeans, while a buffer of 50 feet is required for crops such as sweet corn. A buffer may need to be somewhat larger if for example the growing area is located downhill or downwind, or it may need to be quite a bit larger if you are located next to crops that are sprayed aerially.

Paperpot Transplanters and Biofilm: We consider the paper chain pots to be compostable, in the same category as paper mulches. Learn more about our stance on paper pot transplanters and biofilm.  

If you still have questions about how your practices align after reviewing this page, please reach out to suzannah@naturallygrown.org