Draw a vertical line near the left edge of the paper to create the graph's y-axis. Draw a horizontal line near the bottom edge of the paper, intersecting the y-axis near the lower left corner, to create the x-axis. Label the low end of the y-axis with a zero. Label the x-axis with the title of the first column in the data chart (e.g. "Plant Type") and the y-axis with the title of the second column (e.g. "Height").
Divide the y-axis into equal increments reaching from zero to two or three increments higher than the highest value on the data chart. Label the divisions with increasing numbers. If the lowest data value is more than one-quarter of the way between zero and the highest value, draw a small zigzag above the zero to indicate a break in the axis and start with a value slightly lower than the lowest value on the data chart. For example, if the values range from 77 to 94, divide the y-axis into even increments of 5 from 75 to 100.
Define the edges of the bars by dividing the x-axis with a number of evenly spaced marks one greater than the number of categories or entries in the data chart. If desired, leave some white space on the far left and far right of the graph. For example, if you have seven data points and the x-axis is 8 1/2 inches long, you can allocate 1 inch per bar, leaving 3/4 inches empty on either side.
Label the base of the first bar with the name of the first category. Draw a horizontal line on the graph to mark the top of the bar at a height that corresponds with that category's value on the data chart. Connect the ends of the horizontal line to the marks on the x-axis to create a bar for that data point. For example, if the first line on the data chart reads "Sweet Pea: 25 inches," label the first bar "Sweet Pea" and draw a line at the height that matches 25 inches on the y-axis.
Repeat to create a bar for every line in the data chart. Color the bars in with different colors. Write a title for the graph at the top of the page.