What is the Halachah when a person fills the upper story of his house with
soil and grows plants there? If a person takes an Atzitz Nakuv to the upper
story of his house, it is clear that what grows in the Atzitz Nakuv is not
Chayav in Terumos u'Ma'aseros (ROSH, Gitin 2:22). Will the same Halachah
apply when a person fills the upper story with soil and grows plants in that
soil?
(a) The ROSH (Teshuvos 2:4) writes that only a portable pot of land (like an
Atzitz or a boat) is exempt, mid'Oraisa, from Terumos u'Ma'aseros when it is
not Nakuv, because it is not considered "Tevu'as Zar'echa ha'Yotzei ha'Sadeh
Shanah Shanah" (Devarim 14:22), the produce of the ground that is produced
year to year, which implies that it grows the way that plants normally grow.
In contrast, if a person plants inside a non-portable item (such as in the
upper story of his home), then it is considered as though he planted on the
ground of Eretz Yisrael, because it is considered attached to the ground
regardless of the amount of space separating the upper story from the ground
floor, since the upper story is attached to the ground floor by the support
beams that hold it up. Therefore, what grows in the upper story is Chayav in
Terumos u'Ma'aseros, mid'Oraisa. (See TOSFOS in Bava Metzia 88a, DH Ba'al
ha'Bayis, who might also be of this opinion.)
(b) However, the VILNA GA'ON (in the Shulchan Aruch) rejects the opinion of
the Rosh and rules that whether or not the object is portable, if it is
separated from the earth of Eretz Yisrael by a solid partition, it is
considered to be an Atzitz Nakuv and, mid'Oraisa, it is not Chayav in
Terumos u'Ma'aseros. This also seems to be the opinion of TOSFOS (7b, DH
Ha), who asks that if a person brings soil to an upper story in a house in
Eretz Yisrael, what grows there is exempt from Terumos u'Ma'aseros, and
thus, Tosfos asks, why does a Shali'ach not have to say "b'Fanai Nichtav"
when bringing a Get from there?
If Tosfos holds like the Rosh, it would be obvious why the upper story is
considered to be part of Eretz Yisrael, since -- if a person fills the upper
story with soil and grows plants there -- those plants *are* Chayav in
Terumos u'Ma'aseros. (It is interesting to note that the Rosh himself asks
the question of Tosfos, despite what he writes in the Teshuvah.)
However, there is another reason to exempt what is planted in an Upper story
(or anywhere in a house for that matter) from Ma'aser. The Yerushalmi (Orlah
1:2, cited by the Mishneh l'Melech, beginning of Hilchos Shevi'is) states
that a tree planted inside of a house is exempt from Ma'aser because the
verse (Devarim 14:22) obligates only produce "ha'Yotzei ha'Sadeh Shanah
Shanah" -- that which grows from a *field* -- in Ma'aser. A house is not
considered a field.
The RAMBAM records this in Hilchos Terumos (1:10). However, he writes that
what grows in a house is still Chayav in Ma'aser *mid'Rabanan*, just like
fruits that are picked from a tree in the *yard* ("Chatzer," which is not a
field) are Chayav in Ma'aser (when one picks two or more fruits at one
time).
(c) The RA'AVAD there argues that what grows in a house is exempt from
Ma'aseros even mid'Rabanan. Accordingly, what grows in an upper story should
also be exempt even mid'Rabanan, according to the Ra'avad, because it does
not grow in a "field" ("Sadeh").
The CHAZON ISH asks, according to the Rambam and Ra'avad, why does our Sugya
insist that what grows in a boat is Chayav in Ma'aser, mid'Oraisa? If it is
growing in a boat, it is not growing in a field!
The Chazon Ish answers that only when it grows in a covered area is it not
considered to be in a field. If it grows in an open area, it is considered a
field. The boat is uncovered and therefore it is Chayav in Ma'aser,
mid'Oraisa.
According to the Chazon Ish, a tree that grows in a Chatzer is Chayav in
Ma'aser, mid'Oraisa, since it is exposed to the elements there and is
considered to be in a field ("Sadeh"). When the Rambam writes that what
grows in a house is not less Chayav than what grows in a Chatzer, he means
that what grows in a house is not exempt from Ma'aser because it did not
*enter* the house, but it grew there, just like what grows in a Chatzer is
not exempt from Ma'aser because it did not *enter* the Chatzer, but it grew
there (Berachos 25b, Gitin 81a).
RAV CHAIM KANIEVSKY (in his footnotes to the Rambam) suggests that perhaps
the Rambam does not distinguish between a covered house and an uncovered
house -- neither are considered to be a field. Rather, the reason what grows
in the boat is Chayav in Ma'aser, mid'Oraisa, is because the Mishnah is
discussing a person who covered the floor of the boat with earth and plowed
it, making it into a field. (See Rambam, Hilchos Ma'aseros 4:14.)
(Rav Chaim notes that the Rambam and Yerushalmi write that what grows in the
house is exempt only from *Ma'aser*. It is perhaps Chayav in *Terumah*,
since the laws of the Chiyuv of Terumah are not identical to those of
Ma'aser. See Rambam, Hilchos Terumos 2:6).