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Purchasing a Fruit Tree Grafted in a Nursery
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Can I plant a fruit tree that I purchased from a nursery that was grafted onto the rootstock of another species? The Torah prohibition of kilayim extends to grafting different species of fruit trees together. Not only may one not graft a tree onto the rootstock of another species, but one may not replant such […]
Planting Vegetables Near a Grapevine Outside Israel
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I have a grapevine growing in my garden (not in Israel). May I plant other vegetables near the grapevine? The Torah (Devarim 22:9) prohibits planting klei ha’kerem (planting grains or vegetables in the proximity of a vineyard), even though no grafting occurs. Although, the Biblical prohibition applies only to the land of Israel, however Chazal […]
Are Genetically Modified Organisms (GMO’s) Kosher?
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Are genetically modified organisms (GMO’s) kosher? I have heard that they can splice the genes from one type of plant into another. For example, canola seeds can be modified with the genes from the California Bay tree. Does this affect the kosher status of these foods? The Torah (Vayikra 19:19) forbids mixing different species of […]
Waiting Six Hours After Cheese
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Why exactly do people wait six hours after eating aged cheese and after very pungent cheese, even if not aged? (v. Yoreh Deah 89:2 and Taz ibid. s.k. 4) Poskim point to the reasons for waiting after eating meat before consuming dairy foods and apply these reasons to the case of hard cheese (before meat) […]
What Makes Cheese Gevinas Yisroel?
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What makes cheese gevinas Yisroel? Even if one consumes cholov stam, unsupervised milk, he is not permitted to eat unsupervised cheese. The prohibition of gevinas akum, unsupervised cheese, is unrelated to the prohibition of cholov akum, and pertains under all circumstances. Only gevinas Yisroel, cheese with special kosher supervision, may be eaten. According to the […]
Kashering the Glass Window in an Oven
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If glass cannot be kashered, how do I kasher the glass window in my oven? As we explained previously, there are two reasons given as to why Ashkenazim do not kasher glass. One reason is because we compare glass to cheres (earthenware). The other reason is because we are concerned that one might not kasher glass properly […]
OU-Certified Wine Produced in Israel and Heter Mechira
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I would prefer not to rely on the heter mechira, (selling the fields in Israel to a non-Jew) with respect to shemita produce grown in Eretz Yisroel. If I buy OU-certified wine produced in Israel, is there a possibility that the supervision is based on the heter mechira? (A subscriber’s question) OU policy is not […]