。
Overall, this year's pomato growth has been good.
Literal
This-year [attributive-の] pomato [attributive-の] growth [topic-は] overall good is-[polite-です].
Gardening report. おしなべて ('overall, across the board, generally') is a literary adverb, more formal than 全体的に. 生育 ('growth, development') is used for plants. ポマト ('pomato') is a hybrid plant created in 1978 by grafting potato and tomato — a curiosity of horticultural science (not commercially successful).