The language in lines 9 through 14 suggests that new coffee plants require (1) isolation

(2) fertilization

(3) irrigation

(4) protection

Coffee-growing is a long job. It does not all come out as you imagine, when, yourself young and hopeful, in the streaming rain, you carry the boxes of your shining young coffee-plants from the nurseries, and, with the whole number of farm-hands in the field, watch the plants set in the regular rows of holes in the wet ground where they are to grow, and then have them thickly shaded against the sun, with branches broken from the bush, since obscurity is the privilege of young things

I think that it need isolation because when highlighted, "have them thickly shaded" and "Obscurity is the privilege of young thing," its trying to say that they need to be unknown and protected. so i think isolation

Explanation:

taking into account that a theme is the central topic a text treats and can be developed through a story, play, poem etc. the following are themes that can be further developed:  

my best friend jeffrey has many unusual interests. (the story could be about each of the unususal interests)

once a man gives his soul over to evil, he can never go back. (this could be a saying or a proverb)

the three sheepdogs lay around the yard all day. (it could be developed detailing how each of these sheepdogs lay around)

a priest's collar has an unusual effect upon people. (it could be developed detailing the different effect upon people)

innocence is a powerful force in a world full of corruption. (it could be developed detailing how is a world full of corruption)

king lear is a play shakespeare wrote later. (it is just a sentence and doesnt give any idea or topic to be discussed in details.

evil often wears the disguise of innocence. (this could be a saying or a proverb)

that’s the kind of bug henry was; and if we’d a had him along ’stead of our kings, he’d a fooled that town a heap worse than ourn done.”