Raul: Thanks for the taste description. What about the seed size ?  Are they easy to germinate ? How long do they take ?

After the tree has given the bananas ,when you cut the stalk, you can remove the flowers from the red cover and cook the flowers. Sauté some onions, put the flowers+some grated coconut+pinch of salt and let it cook for some time under low fire.

I do have a huge tree of Flacourtia indica commonly called jagoma from seed I brought (1980) from Goa,India. Tree is huge (15m tall) and bears fruit more than twice a year. Plant took 5 years to fruit. Fruits are tasty, sweet .Taste improves when you massage the fruit between your palms.
   Curious to know how this Flacourtia compares to Flacourtia inermis (Katu lovi) found in Sri Lanka.

Planting a pineapple top depends a lot on the source of the pineapple. Here in northeast of Brazil which is a pineapple producing area if you buy a fresh nice pineapple in the city market,  eat the fruit and plant the top it will grow but  will take 18- 24 months to fruit . Rooting is accelerated if you remove  some of the lower leaves and keep this part bare in contact with soil.  Planting a slip or a sucker,  fruits in 12-15 months. Have about 200  "Pernambuco" variety in my garden.

With regards to Triphal´s comment: " I am helping other Nurseries and home owners, promoting ( Totally Non Commercial ) rare but useful low land tropical fruit trees from around the world "     I would like to vouch on  Triphal´s  valuable knowledge and help he has conveyed to me on the flora of India.

You did not specify the syzygium you have but, it looks to be Syzygium cumini (Eugenia jambolam) native to India. It will fruit in 2-3 months This variety is invasive in many parts of the world, inclusive in northeast Brazil. Fruits are pink, sweet and tasty. In Goa they make wine of the fruits.  Consumption of fruits  and seeds in powder form has been shown  to lower blood glucose levels but it cannot be used to treat diabetes as the problem of standardization has not been worked yet.

It would help a lot if  put  a scale/ruler in mm or inches by the side of your fruit, in your photos

An agriculture products seller aproached me a few days ago to sell me silica (?) dioxide powder as a water retainer for plants. He advised me to soak a quantity of powder with water  overnight and put it in the pit where I was going to plant like a citrus graft.  Would like to know if this technique is effective. Anybody used this technique to retain water in a dry soil ?

Looks like you have Coccinea grandis or indica. They reproduce better from a stalk than from seed.

As to what I know , and experience on departure or entry into Brazil, you have to fill a declaration attesting that you are not bringing in or taking our seeds or plants  in/out of Brazil. False declaration if caught is liable for prosecution. You can enquire about rules/procedures at the Consular Services of Brazil, in your country.

I do have mammea americana (Mamey Apple), known in Brazil as Abricó do Pará, trees in my garden. They are  Dioecious. Seedlings sprout during the rainy season when ripe fruits fall in the ground. They take 6-8 years to bear fruit.

Could you please explain to me what correlation the insulin plant Cissus has to the reference www.ncbi.nlm.nih.gov/pubmed/12578546  you cite ?