Visitor message from soybeansaregreat

I have 2 big photoperiod outdoor in ground plants. One I sprayed with neem and Castile oil road for aphids. It’s looking good now. They are about to enter flower mode. What preventative spray can I apply now, before flowering, to keep aphids off for the next 6/8 weeks. There is a flowering auto plant close by that has aphids now. I sprayed this little one with water to knock off aphids. It’s looking good looks better. Will probably need to do again. But back to my question, what can I put on big plants do aphids will stay off till harvest? Thank you

[Soybeansaregreat]

One recipe called for using peppermint, rosemary, and eucalyptus oil plus soap.