Question: Guava or Psidium guajava
About 5 years ago I obtained the seeds of Psidium guajava and planted them, almost all of them sprouted, but with the passage of time, especially because of the winter frosts (I live on the border between Lombardy and Piedmont), I have only one plant left I take care of it jealously (every winter I take it inside the house and place it in front of a window that faces south in an unheated room, during the summer I bring it out in full sun). Excluding the vase, it is almost a meter high and as I have already said, it would already have the age to bear fruit, but it hasn't happened yet, I wanted to ask what could be the reason. Maybe something is missing. As a fertilizer I use low release ones and not enough because I'm always afraid of exaggerating. It is often attacked by aphids that I fight with regular administrations of linseed oil mixed with the appropriate soap.
Thanks for any advice you can give me.
Answer: Guava or Psidium guajava
guajava is a fruit tree of South American origin, which is grown in tropical and subtropical places; in Italy there are small cultivations of this sapling, in Sicily, therefore in areas with a decidedly mild winter climate, where the frosts are only sporadic, short and of small entity.
Psidium obtained from seed can begin to bear fruit after only two years from the moment they begin to sprout, but in not completely favorable climatic conditions they can serve up to 6-8 years before the plant blooms.
It also happens with lemons that the winter spent at home causes the total or partial lack of flowers; this is because the climate in the house, despite being hot, is not entirely favorable to the development of fruit trees; mainly the problem is due to the lack of humidity in the air, since heating in the home causes very dry and dry air, such as that found in the garden in the middle of July.
In addition to this, for many plants it is not "normal" to spend a few months with high temperatures, drought, but a few hours of brightness. For this reason it often happens that the plants grown in the apartment do not have the correct development and do not follow the normal course of the seasons. In fact, many succulents, if grown at home, do not produce any flowers; but the same can be said of dozens of plants grown in the apartment, such as ficus, which produce neither fruit nor flowers in the home.
So, maybe your psidium is still too young, or maybe you need to spend the winter outdoors, or in a cool place anyway.
If possible, try to grow it, in the cold months, in a poorly heated area of the house, such as a stairwell, which is still bright.
Or, if possible, try to grow your sapling in a cold greenhouse, or even outdoors, but in an area sheltered from frost and very sunny, covering it with non-woven fabric in case of frost.
I live in Brescia, and my neighbor has an orange tree in the garden, which every year amazes us with flowers and fruits; how does?
Well, he planted the young sapling a couple of meters from the wall of the south-facing house, so that he can enjoy as many hours of sunshine as possible; in addition to this, as soon as the weather warns that the temperatures will drop, it shields the tree with frames that form a greenhouse, all around the plant. And now the tree is about thirty years old, and it is truly beautiful.