[murch]

My brussel sprout plants have all produced good sized sprouts but the leaves have started to turn yellow. Anyone have any idea what may be causing this.

[michael brenock]

if the leaves are turning yellow and brown then it indicates that the sprouts are nearing maturity. This is probably an early variety. if the sprouts are full size and fit to pick then this is normal. However if the sprouts are still small it indicates that the plants were planted too late or that the soil is lacking in nutrients.
michael brenock horticultural advisor (retired)