Directions on seed packets usually tell how much dirt to put over the seeds. Some gardeners say to only plant a seed as deep as it is tall. Is this important? Let’s find out.
Question: Does it matter how deep a seed is buried?
10 pumpkin seeds
5-16 oz. planting cups
Step 1: Open your science journal. Write the date and Investigation 6. Copy Table 1 into your journal.
Step 2: Number the cups 1 to 5. Mark each cup with a little line at 4cm, 6.5cm, 9cm, 11.5cm and 14cm from the bottom.
Step 3: Put 4cm potting soil in each cup. Be sure this is pushed down firmly and still 4cm deep. If you hold the cup up with a light behind it, you can see the dirt is level with your first mark.
Step 4: Lay two seeds on the dirt in Cup 1
Step 5: Put 2.5cm potting soil in each cup to the 6.5cm mark, pushing it down firmly
Step 6: Lay two seeds on the dirt in Cup 2
Step 7: Put 2.5cm potting soil in each cup to the 9cm mark, pushing it down firmly
Step 8: Lay 2 seeds on the dirt in Cup 3
Step 9: Put 2.5cm potting soil in each cup to the 11.5cm mark, pushing it down firmly
Step 10: Lay 2 seeds on the dirt in Cup 4
Step 11: Put 2.5cm potting soil in each cup to the 14cm mark, pushing it down firmly
Step 12: Lay two seeds on the dirt in Cup 5
Step 13: Add water to all the cups so the soil is damp but not soggy. Cover the tops with plastic wrap. Set the cups in a warm place.
Step 14: Check the cups every day for pumpkin sprouts. Take the plastic wrap off when the sprouts appear.
Step 15: Count seven days after the first seeds germinate or when the seeds planted the deepest appear, carefully dump each cup out and look at the seeds.
Describe the sprouts when you take them out of the cups:
What is the best depth to plant the pumpkin seeds? Why do you pick this depth?
Can seeds be buried too deep to grow? Why do you think this?
Does the size of the seeds matter? Why do you think so?