Apparently my state, California, has stricter restrictions of shipping plants. Many online nurseries say that I must pay extra money for a phytosanitary certificate to ship to California or else the plant may be rejected by the post office. Are phytosanitary certificates only necessary when crossing state lines or are they also necessary interstate? I live in Northern California and want to buy plants from a nursery in Southern California. I'm wondering if they can legally ship the plants to me without paying for the certificate.
A phytosanitary certificate should only be necessary when plants are shipped between states or countries. I've never heard of one being required to ship inside a state. However, you can always call the nursery to confirm that they don't need one to ship your order inside the state of California.