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Does Kilaim apply to plants with no edible parts, like grass? Do homeowners need to be concerned with how they landscape if they have only plants with no edible parts in their plans?

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Just to be clear you are talking about kil'ei zeraim and not kil'ei hakerem? – Double AA Jul 30 '12 at 18:57
@DoubleAA, wouldn't Kilei HaKerem inherently be fruit-bearing? – Seth J Jul 30 '12 at 19:08
The Kerem part, but perhaps you are asking about the other element. (The answer regarding non-edible plants is the same AFAIK). You can ask about both if you want, I just think it's worth clarifying because people often conflate the two. – Double AA Jul 30 '12 at 19:09
@DoubleAA, you mean if you mix Kerem with non-fruit plants? I was not asking that. I was asking non-fruit with different non-fruit. You're saying fruit (even Kerem) with non-fruit is ok? – Seth J Jul 30 '12 at 19:15
I believe so, yes. I'm pretty sure not-fruit is like not-there. – Double AA Jul 30 '12 at 19:17
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The Rambam writes (Hilchot Kilaim 1:4)

אין אסור משום כלאי זרעים, אלא זרעים הראויין למאכל אדם; אבל עשבים המרים, וכיוצא בהן מן העיקרין שאינן ראויין אלא לרפואה, וכיוצא בהן--אין בהן משום כלאי זרעים.‏
The prohibition of Kilei Zeraim (mixed seeds) only applies to seeds [of plants] which are human food. Bitter herbs and other herbs which are only used for healing or some other purpose are not included in the prohibition of Kilei Zeraim.

The Shulchan Aruch rules as such almost word for word in YD 297a:3.

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