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My students wrote the following sentences some of which i consider totally Un-English. Please give your advice whether any of all of the are of good English.

1. The sunflower is yellow colour. (which i think is correct but redundant)

Shall i suggest,

a. The sunflower is yellow in colour. or

b. The sunflower is yellow.

2. He planted many rose flowers. (again, i think this is redundant and improper to be deemed as good English)

He planted many roses. (this shall be enough)

Please leave your generous comments. Thanks.
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These are the natural utterances:

The sunflower is yellow.
He planted many roses / rose bushes.
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The color of sunflower is yellow -is the most natural.
Awencea. The sunflower is yellow in colour. or
b. The sunflower is yellow.

No article is needed in A and B

Wrong, wrong and wrong, Dimsum. Native speakers seldom use the word 'colour' outside of questions, since the names of the colours are obvious: What colour is your shirt? But Is your shirt blue or navy? My new car's red. etc. And of course articles are needed: 'sunflower' is a singular countable noun.
I totally agree with Micawber.
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