Accidentally ate a new fruit without saying Shehechiyanu-May Shehechiyanu still be said?
If one ate a new fruit without saying Shehechiyanu, then some Poskim rule that Shehechiyanu may be said the next time he eats the fruit. Other Poskim, however, rule that Shehechiyanu may no longer be said and he has thus lost the opportunity to recite the blessing over this fruit. Practically, one is to say the blessing without Sheim Umalchus the next time he eats the fruit. [The Nussach of the blessing is “Baruch Shehechiyanu Vekiyimanu Vehigiyanu Lizman Hazeh.” Alternatively, one should eat another Shehechiyanu fruit and have this fruit also in mind.]
Remembered prior to finishing eating the fruit: If one began eating a fruit without saying Shehechiyanu and remembered prior to finishing eating the fruit, then he may still say Shehechiynau upon eating the remainder of the fruit. This applies even if he already ate more than a Kezayis of the fruit. Furthermore, some Poskim rule that even if he already finished eating the fruit, if he still plans on eating more of the fruit and will not need to repeat the before blessing prior to eating it, [i.e. has yet to say an after blessing over the fruit, and did not intend to stop eating any more of the fruit, and did not switch areas in between] than the blessing of Shehechiyanu may still be recited prior to eating the second fruit.
Ate the fruit before it was fully ripe: If one ate the fruit without saying Shehechiyanu prior to it being fully ripe, then he may still recite Shehechiyanu upon later eating the fruit after it has ripened. Furthermore, initially one is never to say Shehechiyanu on a fruit until it has fully ripened. However, if one recited Shehechiyanu upon eating the fruit prior to it being fully ripe [but being ripe enough to recite a blessing of Haeitz over it], then he is not to repeat Shehechiyanu upon eating the fruit after it has ripened.
 See Seder Birchas Hanehnin 11:13; Luach Birchas Hanehnin 11:3; Kaf Hachaim 225:31; Ketzos Hashlchan 63 footnote 9; Piskeiy Teshuvos 225:13
 Rama 225:3 [regarding reiyah]; Maharil 143; Levush 225 [regarding eating]
 Rabbeinu Manoach Brachos 10:2; Igur in name of Semak, brought in Beis Yosef 225; Radbaz 1:130, 319, brought in M”A 225:9; Kneses Hagedola 225; Halachos Ketanos 1:230; P”M 225 A”A 10; Ben Ish Chaiy Reiei 15; M”B 225:13
 Seder Birchas Hanehnin ibid; Luach ibid; Kaf Hachaim ibid
Ruling of Tzemach Tzedek: Some Poskim rule that the blessing of Shehechiyanu does not have the concept of a blessing in vain relevant to it, and hence may be said even by a case of Safek. [See Piskei Dinim of Tzemach Tzedek Likkutim 407b; Toras Menachem Hisvadyus 5749 3:127] Vetzaruch Iyun if this approach comes to argue on the ruling of Admur ibid.
 Kneses Hagedola 225; Maharam Shick O.C. 89; Ben Ish Chaiy ibid; Kaf Hachaim ibid; Piskeiy Teshuvos ibid
 P”M “If he ate a little and then says a blessing it is fine”; Ketzos Hashlchan 63 footnote 5; 9 that the intent of the P”M is that he ate less than a Kezayis
 Birchas Habayis 24:7; Ketzos Hashlchan 63 footnote 9; Unlike possible implication of P”M ibid
 Birchas Habayis 24:7; Ketzos Hashlchan 63 footnote 9 based on Admur Seder Birchas Hanehnin 12:14 regarding one who forgot to say Shehechiyanu upon wearing a new garment, that so long as he is still wearing it or removed it with intent to re-wear right away, the blessing may still be recited. See also Rama 22; Ateres Zekeinim ibid; Piskeiy Teshuvos 225:13
 Ketzos Hashlchan 63 footnote 9; See all Poskim in next footnote
 Seder Birchas Hanehnin 11:13; Luach 11:3; Rama 225:3; Michaber 225:7; Rashba 1:250
 Luach ibid; See Ketzos Hashulchan 63 footnote 7
 Seder Birchas Hanehnin 11:13; Luach 11:3;