Pumpkin Seed Germination, Time, Temperature, Process: Pumpkins are a warm-season perennial vine with edible seeds. The fruit is typically 5–11 pounds (2.3–5 kg) in weight, up to 30 inches (76 cm) long, and orange in color. Seeds are often roasted as a snack or used in cooking, also eaten raw on salads or with dips. They can also be pressed for oil.
Pumpkin seeds are a common ingredient in Mexican cuisine and many other dishes worldwide, such as Chinese dim sum or Indian Chaat snacks. Pumpkin seed oil is commonly used as a cooking oil. In the EU, the main variety of pumpkin seed officially recognized as “oil” is selected from among those grown to have a minimum content of 55% linoleic acid.
The scientific name is “Cucurbita pepo”. It has many other names throughout the world, though they may be regionally different: “Jarillo”, “Trágala Negra” and – in parts of Africa – “Kunde” or “Shello” while in Latin America it is known as “Quiebra Jícara”, and in the Philippines, it is called “Kalabasa”. Pumpkin seed oil contains 41.9% of polyunsaturated fatty acids (including 20.2% linoleic acid), 25.5% monounsaturated fatty acids (including 13.3% oleic acid), 3.4% of saturated fatty acids less than 1.5% of stearic acid, and 10.2% phytosterols (including 544 mg/kg of free cholesterol).
Process of growing Pumpkins from seed
Pumpkins can be grown from seed with the following requirements. Seeds should be fresh, washed and dried before planting. Fill small pots or trays with soil/compost mix or potting soil. Place one seed about 1 inch deep in each pot. When several leaves have sprouted together, remove all but the strongest plant and its roots.
Pumpkins prefer warm weather; if there is a cold spell, cover the seedlings with horticultural fleece until it passes. Transplant the plants after one month when they have grown to about 3 in tall and can be planted outside once nighttime temperatures remain at least above 10 to 15 degrees Celsius (50 to 59 degrees Fahrenheit).
The best time of year to plant pumpkin seeds is in spring. On average, pumpkins are planted around May 1st in the United States. Pumpkin seeds are planted using a dibbler, or using the back of a hoe. The seeds should be planted about two inches away from each other, with roughly six inches between rows of plants.
Pumpkin plants are usually male or female. Sometimes, plants are hermaphroditic, though this is often unsuccessful. To identify the sex of your plant, look at the base of the leaves for a small bulge that contains either a tiny pumpkin or an ovary of what will be a pumpkin flower in about 8 weeks. If the bulge is a pumpkin, it’s female; if it contains an ovary, it’s male.
Pumpkin plants will thrive in full sun exposure and well-drained soil. They require at least 8 hours of sunlight each day. When night time temperatures are below 20 degrees Celsius (68 degrees Fahrenheit), they may require some additional artificial lighting, such as grow lamps.
Pumpkin vines are fairly vigorous at the start of the season. If allowed to sprawl on the ground, they will root along the entire length of their stem and send out new shoots that can become independent plants. These new plants produce flowers which are self-fertile or may be cross-pollinated by insects.
Pumpkins are generally treated like other cucurbit crops, and should be watered daily if rainfall is less than about per week. Watering frequency may increase during extended dry periods. The vine and roots are sensitive to salinity, so soil should be kept well flushed with water throughout the growing season.
Time to take Pumpkin seeds take to germinate
Pumpkin seeds take 1-3 weeks to germinate, with proper soil temperature being the limiting factor. The optimal daytime soil temperature for germination is about .
A single pumpkin plant can produce anywhere from one to 100 pumpkins. A good crop of pumpkins requires a large amount of space, as much as are needed per each.
Pumpkin seeds germination period
Seeds planted in early spring need warmer soils to germinate, about . Soil temperatures above are also optimal for good germination rates, but may be too warm if soil is shallow or light coloured.
The pumpkin seed will emerge from the seed coat and radicle to form a root that grows into the soil. This root is able to take up water and nutritients while the shoot emerges from the seed coat as a small plant that forms new leaves, stems, and eventually flowers.
Tips for Pumpkin seeds germination
Ensure that seeds are properly dried before storage, as wet seeds may develop mold.
Seeds should be planted from late April to early June in northern zones, and from mid-April to May in southern states. If growing zones have a shorter season, seeds should be planted closer together so plants grow larger before cold weather returns. Seeds planted too late may not have sufficient time to mature.
Seeds should be planted no more than 1/4- inch deep in loose soil with a sand or silt loam texture and good drainage. Sow the seeds in rows, spacing them 6 inches apart from each other and 12 inches apart from adjacent rows. Rows can be spaced 3 to 4 feet apart.
Seeds require 6 to 8 hours of sunlight per day, so delayed germination can occur when planted in shaded areas. Ensure that plants get enough light during the growing season, especially if fruit production is desired.
Pumpkins prefer moist but well-drained soils high in organic matter. Sandy loam soils work best, as they hold nutrients and moisture better than other soils. Clay-based soil is often too dense for proper root growth and will produce poorly developed plants with yellow leaves.
Pumpkins are very sensitive to saline conditions, so ensure that the soil has good drainage to avoid the accumulation of salts from irrigation water or poor quality irrigation water. Most pumpkins are heavy feeders that require about 150 pounds of nitrogen per acre, and additional amounts may be necessary.
Germinate Pumpkin seeds indoors
Pumpkin seeds are viable for planting even after the growing season, but their germination rate will be low. Seeds can be stored over winter in moist sand or sawdust at 32 to 45 degrees Fahrenheit to improve germination rates in the spring. Optimal storage temperature is between .
Planting pumpkin seeds indoors allows them to receive adequate light and water; however, they will not germinate until soil temperatures reach during the day and at night. Seeds should be started indoors about 1 month before planting outdoors.
Pumpkin seeds can also be directly seeded into the garden in early spring after the last frosts have passed. Planting this way avoids problems with seed rot if overwatering occurs, but the soil may not warm up in time for proper germination.
If growing multiple pumpkin plants close together, space them correctly before planting. Seeds should be planted 2 to 4 inches apart within the row and 6 to 12 inches apart between adjacent rows. This spacing will allow for good air circulation around plants while still allowing room for the vines to expand.
Pumpkin plants should be grown in full sun, as partial shade can lead to poor fruit set. Plants need 6 to 8 hours of direct sunlight per day; therefore, planting on the south side of a structure will help ensure adequate light exposure throughout the growing season. Alternatively, overhead watering may reduce the amount of water available for plants, so cultivate this area with a raised bed to provide adequate drainage.
Pumpkin plants are very susceptible to frost damage in the early stages of growth. If an unexpected late frost is forecasted, protect newly planted seedlings by covering them or moving them indoors. Protecting vulnerable pumpkin seedlings can prevent loss of plants and minimize damage to leaves and stems.
Pumpkins are susceptible to several diseases including anthracnose crown rot, powdery mildew, downy mildew, bacterial wilt, fusarium wilt, gummy stem blight, scab and phytophthora crown rot. To limit the risk of disease development on pumpkin plants, avoid overhead watering, don’t handle plants when they are wet and remove all plant debris at the end of the season.
Paper towel germination method for growing Pumpkin seeds
In this method you’ll need several paper towels, a cup of water, a plastic bag and a warm place for germination. You should soak the Pumpkin seeds in a cup of water overnight so that they swell up which ensures better germination. The next day place two paper towel sheets on your working surface, label one sheet ‘plant’ and the other with the variety name. Place the damp Pumpkin seeds on the ‘plant’ sheet with 1/4 inch spacing between each seed. Fold this sheet in half, with both sheets face to face, so that it becomes a 4-ply paper towel sandwich. Arrange these folded towels in a flat container which is big enough for all the paper towels with seeds on it, cover the container with a plastic bag and seal it well. Put this container in a warm place (about 77 degrees Fahrenheit) out of direct sunlight. You can also use old polystyrene boxes to germinate your Pumpkin seeds if you’re concerned about potential light exposure through transparent plastic bags.
After three to seven days, you should see the seedlings emerge from between the paper towels. Once these Pumpkin seedlings develop their first set of true leaves, carefully separate them from the paper towel and transplant to a bigger container with fresh potting soil. You can then transfer these young plants into your garden after all danger of frost has passed.
In this method you’ll need a Pumpkin, paper towels, a plastic bag and a warm place for germination. You should remove the pumpkin stem and wash it thoroughly to remove any dirt or insects that may be hiding inside; then slice it in half vertically and scrape out the seeds and pulp without damaging the inner wall membrane (the thin white layer between the outer shell and the seeds). Rinse the pieces of Pumpkin under running water to remove any remaining pulp.
Spread out paper towels, place pumpkin pieces flesh side down on them and fold in half; then cover with another set of folded towels. Cover this flat package with a plastic bag and seal it well. Put this container in a warm place (about 77 degrees Fahrenheit) out of direct sunlight. You can also use old polystyrene boxes to germinate your Pumpkin seeds if you’re concerned about potential light exposure through transparent plastic bags. After three to seven days, you should see the seedlings emerge from between the paper towels. Once these Pumpkin seedlings develop their first set of true leaves, carefully separate them from the paper towel and transplant to a bigger container with fresh potting soil. You can then transfer these young plants into your garden after all danger of frost has passed.
Pumpkin seed germination temperature
The ideal temperature for germination is between 60–70°F. Temperatures below 50°F can slow down germination and temperatures above 80°F will usually prevent it from occurring at all, pronounced heat stratification also irritates the embryo and inhibits germination.
Process for germinating Pumpkin seeds
- Soak the Pumpkin seeds in a cup of water overnight so that they swell up which ensures better germination.
- The next day place two paper towel sheets on your working surface, label one sheet ‘plant’ and the other with the variety name.
- Place the damp Pumpkin seeds on the ‘plant’ sheet with 1/4 inch spacing between each seed.
- Fold this sheet in half, with both sheets face to face, so that it becomes a 4-ply paper towel sandwich.
- Arrange these folded towels in a flat container which is big enough for all the paper towels with seeds on it, cover the container with a plastic bag and seal it well.
- Put this container in a warm place (about 77 degrees Fahrenheit) out of direct sunlight. You can also use old polystyrene boxes to germinate your Pumpkin seeds if you’re concerned about potential light exposure through transparent plastic bags.
- After three to seven days, you should see the seedlings emerge from between the paper towels.
- Once these Pumpkin seedlings develop their first set of true leaves, carefully separate them from the paper towel and transplant to a bigger container with fresh potting soil.
- You can then transfer these young plants into your garden after all danger of frost has passed.
- Multiple, overlapping layers of towels weed out weaker seedlings.
- The remains of the soft shell have a good side and a soft side which is meant for sprouting seeds; make sure you place it with the rough outer skin on top for germinating Pumpkin seeds.
- Remove the seeds from the grewo pumpkins, wipe it with a paper towel to remove excess moisture and place them in small cups or container (without touching each other) covered with plastic wrap.
- Place the covered cups in a warm, dark area for two days where the temperature is above 70° Fahrenheit to initiate germination.
- After 2-3 days inspect the seeds and look for the small white ‘tail’ coming out of them. These tail like growths are where the tap root will come out and this is how you determine if the seeds have germinated.
- Remove it from paper towel when there is a sprouted seedling with at least 1/2 inch tall green leaf with a white stripe going down the middle.
- Place it in a big pot or flat tray with soil just enough to cover the root ball which is created by the paper towel and water thoroughly. This moistens all parts of the paper towel, including those that are not covered with seeds.
- Cover again with clear plastic and place it in a warm area out of direct sunlight.
- Open it up after 1-2 days and add water whenever the top layer of soil becomes dry.
- Transfer to a bigger pot when the seedling grows to 2 inches tall, you can then plant them outside during early summer season once all danger of frost has passed.
- Make sure to use organic Pumpkin fertilizer for your young plants two weeks after you plant them outside, this will ensure good growth and abundant fruit yield.
- You can then transfer these young plants into your garden after all danger of frost has passed.