Thank you both for your input. I appreciate it a lot. Dave Kow, the link you provided was very informative; however, I don't think all those trees and plants are present here in my side of the world.
It's interesting to know that its possible to have blue colored pollen although I don't think there is Siberian squill here in the Philippines but it would be nice though to see bees bring in blue pollen.
I'm an urban beekeeper (my hive is placed at the back porch of our house) so I guess my bees are foraging from the plants and trees of our neighbors since I don't have any plants at all in my house. The common trees that I know of which are present here in my neighborhood are different varieties of mango trees, coconut, acacia trees, papaya trees, guava trees, several variety of garden and wild flowers which I have no idea what the names are (except for roses, chrysanthemum, Malaysian mums and bougainvillea), and some other trees which I do not know the names as well. Sorry, I'm bad at botany.