Crops are generally your main source of silver. Whenever a helper is not busy elsewhere, that helper can provide income with premium trees (those that cost gold) or any crops. Short-term crops usually give more silver per hour, but it is best to keep helpers busy most or all of the time you are away. That requires long-term crops.
Crop
Image
Level
Cost
Pays
Time
Slr/hr
Produces
Agave
14
400
630
2 hrs
115.00
n/a
Barley
22
1,000
1,610
8 hrs
76.25
n/a
Beans
2
20
50
5 min
360.00
Beans
Blue Berry
24
4,000
6,000
24 hrs
83.33
n/a
Broccoli
30
1,400
2,770
24 hrs
57.08
n/a
Cabbage
5
100
500
6 hrs
66.67
Cabbage
Carrots
9
180
890
12 hrs
59.17
Carrots
Coffee
16
600
1,080
6 hrs
80.00
Coffee
Grapes
30
1,400
2,770
24 hrs
57.08
Grapes
Hay Grass
4
80
380
4 hrs
75.00
Hay
Maize
1
10
20
28 sec
1200.00
Maize
Oats
18
800
1,390
10 hrs
59.00
n/a
Onions
2
50
170
1 hr
120.00
Onion
Potatoes
3
60
240
2 hrs
90.00
Potatoes
Pumpkin
6
100
170
15 min
280.00
n/a
Squash
8
150
680
10 hrs
53.00
Squash
Strawberries
22
1,000
1,610
8 hrs
76.25
Strawberry
Sugar Beats
24
1,000
1,510
6 hrs
85.00
n/a
Sugarcane
5
100
140
30 min
80.00
n/a
Sunflower
20
1,000
2,060
18 hrs
58.89
n/a
Tea
12
220
570
4 hrs
87.50
Tea
Tomatoes
7
120
640
8 hrs
65.00
Tomato
Turnips
2
40
120
30 min
160.00
Turnip
Watermelon
10
200
420
2 hrs
110.00
Watermelon
Wheat
1
5
10
28 sec
600.00
Wheat