Poppy Flowers, spiders, and sheep can not be removed or collected with shovels.
The player can buy three magic shovels for 250 magic beans before starting the level and only if the player has none of them. During the level, the player has to spend gold bars instead. He/she has to buy three at least and it will cost him 9 gold bars.
On the PC you may try to buy 6 shovels for Magic Beans with fast action.
Update: From Mobile Version 2.71.6 onwards, the Shovel Booster can be used to plant Seeds directly without the need to swap with a Water Droplet Cropsie.