In Elizabeth Barret Browning's sonnet "Beloved, Thou Hast Brought Me Many Flowers," what advice does the speaker give her beloved?

In response to the many gifts of beautiful flowers that
the speaker of the poem has received from her beloved, which all act as symbols or
tokens of the love that he has for her, she gives a gift in return, which likewise
symbolises her deep love and affection for her beloved. The advice that the speaker
therefore gives to her beloved is to accept this gift, and to keep them so that the
original purpose and message is still clear to him:

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Take back these thoughts which here unfolded
too,

And which on warm and cold days I
withdrew

From my heart's
ground.

It is important to
realise that the author uses the extended metaphor of the flowers to describe her
poetry, her "thoughts" which she gives to her beloved. Just like the flowers she has
been given, she has "withdrawn" her verse from her "heart's ground" throughout the year.
This explains the final two lines of this powerful sonnet and the advice contained
therein:

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Instruct thine eyes to keep their colours
true,

And tell thy soul, their roots are left in
mine.

Thus the speaker urges
her beloved to keep the vitality and the "colour" of her poetry "true" and to remember
that her verse is a product of the love she has for him in her
soul.