Yikes!! Sorry Claudine. Obviously you are not about to order plants from the US. I can only imagine what condition they would be in

. I saw Poland in your avatar but I thought you were just saying you were from Poland. Your English is excellent, better than mine even! Also, your zone of 7a seemed way too warm for Poland to me. I've read a lot of world war 2 books and it seems every time the war in Poland was discussed freezing temperatures were a topic. Also, Poland is farther north than Michigan so it made sense to me that it would be colder. Maybe the Baltic Sea makes it warmer for you? I'm sure you could find a barbados cherry somewhere. Do you have bonsai tree shops anywhere nearby? They are a favorite of bonsai enthusiasts because they grow so well indoors.