Although the peony is beautiful, it depends entirely on help from the green leaves (idiom). However brilliant you may be, you can't do anything without support from others.
trad. 牡丹雖好，終須綠葉扶持
Also written牡丹雖好，終須綠葉扶持【mǔ dan suī hǎo , zhōng xū lǜ yè fú chí】
good, appropriate; proper, all right!, (before a verb) easy to, (before a verb) good to, (before an adjective for exclamatory effect) so, (verb complement indicating completion), (of two people) close; on intimate terms, (after a form of address) hello