Sexuality in the plants is into the flowers. Trees have not flowers. They are reproduced by seeds which form themselves. Ancient trees were reproduced by spores
Most conifers are monoecious, but some are subdioecious or dioecious; all are wind-pollinated. Conifer seeds develop inside a protective energy suppliers cone called a strobilus (or, very loosely, “pine cones”, which technically occur only on pines, not home improvement other conifers!). The cones take from four months to three years to reach maturity, and vary in size from 2 mm to 600 mm long.
The male cones have structures called microsporangia which produce yellowish pollen through meiosis. Pollen is released and carried by the wind to female cones. Pollen grains from living pinophyte species produce pollen tubes, much like those of angiosperms. When a pollen grain lands near a female gametophyte, it undergoes fertilisation of the female gametophyte. Alternatively, the gymnosperm male gametophytes are carried by wind to a female cone and are drawn into a tiny opening on the ovule called the micropyle. It is within the ovule that germination occurs. From here, a pollen tube seeks out the female gametophyte and if successful, fertilisation will occur. In both cases, the resulting zygote develops into an embryo, which along with its surrounding integument, becomes a seed. Eventually the seed may fall to the ground and, if conditions permit, grows into a new plant.
In forestry, the terminology of flowering plants has commonly though inaccurately been applied to cone-bearing trees as well. The male cone and unfertilized female cone are called “male flower” and “female flower”, respectively. After fertilization, the female cone is termed “fruit”, which undergoes “ripening” (maturation).
Those having flowers are not trees but brushes.