It depends. As an OLCC-licensed producer, you cannot grow hemp on your licensed premises. However, you may be able to obtain an ODA license to grow hemp in areas that are outside your licensed premises.
If the hemp grow will not be on the same tax lot as a marijuana producer license and will not be within the licensed premises of any OLCC marijuana license, then there are no OLCC rules that would prohibit you from growing hemp.
If you want hemp to be grown on the same tax lot where a marijuana producer license is located, the producer must have an approved control plan on file before obtaining the ODA hemp grower license. You cannot grow hemp in the area that you have licensed for marijuana production. If you want to grow hemp in an area that is currently part of your producer license, you would need to request and receive approval to remove that area from your licensed premises before obtaining the ODA hemp grower license.