Chlorophyll functions in plants in the process of photosynthesis, ..
that is the main place to trap sunlight for photosynthesis…
Eudicot mesophyll has two distinctregions: palisade mesophyll, containing tightly packed, elongated cells whose placement is antageous for absorbing sunlight, and spongy mesophyll, containing irregular cells bounded by air spaces right next to the stomata.
At that point photosynthesis begins and your little ..
The majority of the large ornamental cherry trees will grow to a height of twenty five to thirty feet and will produce a very vigorous root system and a lot will depend on whether you want to plant any other small plants or shrubs within your garden. I personally would be inclined to choose an alternative tree species such as Ornamental Crab Apple or Japanese Acer Palmatums Cultivars which would be ideal for your small walled garden.