planted in his garden have that divide and reproduce underground the yeargarden produced 4 the second yearit produced bulbsand in the yearthis continueshow many should Geoff expect in year )

Geoff can expect 16 bulbs in year 4.

Explanation:
In the first year, the garden produced 4 bulbs. In the second year, these bulbs would have divided and reproduced underground, so Geoff would have 8 bulbs. In the third year, these 8 bulbs would have continued to divide and reproduce, so Geoff would have 16 bulbs in total.