Orlah & Neta Revay

What is the connection between Tu BiShevat and Orlah? Is this rellevent if I live out of Eretz Israel?

 What you need to do around Tu BiShevat (15 Shevat), if you have a tree now in its fourth year?

What does orlah mean?

Just this morning, we planted a garden in our new home (on Rechov Mekor Chayim in Jerusalem). We now have trees – apricot, peach, clementina, pomegranate – all beyond the four years, and a grape vine in its second year. If grapes do appear, what do we do with them?

I just planted a mature avocado tree a few weeks ago and it just started flowering. Is now (Adar) a good time to clip the buds at this point to prevent orlah fruit from developing?

With great excitement we recently picked some mandarins (tangerines) from our tree, hoping to taste the fruit at last with the reviis bracha.

Unfortunately, they were very dry and not pleasant at all to taste.

There are many left on the tree. 

Is it alright to just let them fall and put them in the trash?

On an agricultural note…do you, by any chance, have a remedy for this problem please?

We have noted that the branches bearing the fruit now have very yellow leaves, whereas the rest of the branches, not bearing fruit, are happily green.

I purchased blueberry seedlings from Kibbutz El Rom, which are now growing on my second-floor balcony in flowerpots. One of the seedlings is from 5781 and is now a fourth-year bush. How can I eat the fruits (I am a member of Otzar Ha’aretz)? How do I redeem them? Do I need to redeem them if I don't bring the fruit inside and eat them on the balcony? What should I do when the blueberries ripen gradually? Should I redeem each time I pick a few blueberries, or can I redeem all the blueberries that will grow this year during the first harvest? Also, when the blueberry bush enters its fifth year, do I need to separate terumot and ma'aserot from individual fruits each time I pick a few blueberries, or should I separate them all at once? Do I need to recite a blessing for the separation?

1) A private individual brought fruit tree saplings from the nursery and left them for a period of time on synthetic grass before planting them in his garden. Does he need to restart the orlah count?

2) We were asked a similar question by a nursery that sells fruit trees to private customers. The owner wanted the nursery to look nice, so he covered the nursery area with synthetic grass. Can the saplings be placed on the synthetic grass?

The question is whether or not synthetic grass is considered a detaching surface (if so, when placing saplings on it, one must recount the orlah years).

Thank G-d we moved into our new home and planted young saplings on 1 Kislev 5774. Can we eat from the fruit now? If not now, when? My uncle planted more mature trees. Do the same laws apply in this instance? If the fruit is still forbidden for consumption, what do we do with the fruit? Can you also explain, in detail, what I am supposed to do in the fourth year?