Is it possible to earn more than 100 lollipops per second?

Solution 1:

Yes, you can get more than 100 lollipops/second, but not by planting more lollipops. 100/s is the max base-rate.

To get more, you need to obtain the following items:

• Shell powder - 3x Lollipops (earned by jumping off a dock picking it up from the floor)
• Pitchfork - 3x Lollipops (earned by entering the castle and finding it - it's in one of the dark rooms)
• Green Shark Fin - 5x Lollipops (earned by jumping off a dock and killing a color-finned shark)

The items stack, for a total bonus for 45x:

Note: According to the descriptions, the "Green Shark Fin" is the only fin to give a bonus to lollipops, but there appears to be a bug that causes any shark fin to give the bonus. In the above picture, I only have the Red Shark Fin...

Solution 2:

The base rate cannot go above 100 lps, however there are three items that increase the rate by a multiplicative factor:

Shell powder from the sea, a pitchfork from the castle, and the green shark fin.

The first two multiplies the rate by 3, the last by 5 for a total maximum rate of 4500 lps.