Work with your children to draw and paint pictures of different kinds of plants on sheets of cardboard. Each child should draw and paint one plant. Then cut out each picture with scissors into puzzle pieces. Mix up the pieces of each puzzle and spread them out on a table. Each child should attempt to put together the picture belonging to the other child, and the first one to do so wins.
Make a matching card game for young children. Use poster board and cut out squares for cards. Draw various types of plants and color the drawings with markers. Below the drawing, write the name of each plant. Be sure to make two identical cards for each type of plant. Then lay out all the cards face down on a table and have each player turn over two cards. If the cards match, then the player sets those cards aside and takes another turn. If the cards do not match, turn the cards back over and allow the next player to go. The player with the most matches, after all the cards have been put into pairs, wins.
Create your own plant game with the theme of "Jack and the Beanstalk." Use a large sheet of cardboard and paint a path of colorful squares for the players to follow in the shape of a beanstalk. Paint four squares in various locations on the board their own specific colors, such as pink, orange, purple and yellow. Make four small decks of cards, each deck colored one of the four square colors. Label one deck "fee," the second deck "fie," the third deck "foe" and the fourth deck "fum." On the back of each card, write something that the player must do, such as sing a plant-related song or name a picture of a plant. Mold game pieces into plant shapes out of clay, let them dry and paint them with acrylic paints. Use dice for each player to roll to determine the number of squares to move along the board. The player who gets to the end of the path first wins.
Write out a list of plant-related items on a piece of paper. These should be plant items that you already have on hand, such as a trowel, seed packets or a small watering can. Hide the items around the house or in the yard in safe locations that your child is allowed to explore in. Give your child a basket with a handle and have him search for the items on the list. If he cannot yet read, read each item on the list for him, but allow him to search on his own. Once he collects all of the items on the list, provide a small prize for his efforts, such as a prize for a party game.