Two variants are possible here: either you run out of coins in the process of planting and get this popup to continue planting, or you accidentally touch the right top corner of the screen while planting.
To earn more coins, rich and famous people from "Klondike financier" magazine advise you the following:
- Complete orders from the Order Board,
- Make Gold Bars in the Crucible and sell them,
- Complete orders for the Merchant Ship,
- Get coins for completing quests,
- Sell treasures to the Trader.
- Make Gold Bars in the Crucible and sell them,
- Complete orders for the Merchant Ship,
- Get coins for completing quests,
- Sell treasures to the Trader.