We take the more stringent opinion that produce of gentile owned land in Eretz Yisrael has kedusha. Among other ramifications, this means that one who buys this produce from a gentile cannot turn around and resell, we would be unable to make use of a general wholesaler of this type of produce (outside a Va’adat Hashmita). We also take the more stringent opinions that commerce with produce from land that was guarded or worked is forbidden.
However, though we are stringent in areas that affect how the land is worked, this does not necessarily mean that we must be so in other areas. Since most of us are ba’alei teshuva this would probably be out of character for us. So, in matters of kedusha and biur we can make use of the lenient positions. A useful example of the lenient position in regards to the kedusha of produce would be to not consider water that shvi’it produce was cooked in as having kedusha, we may throw it out without waiting. We are also lenient on what are considered sefichin (i.e. mushrooms are not included).