When to Plant Bulbs in Fall

Though they bloom in spring, flower bulbs that are planted in fall are known as "fall bulbs". Popular spring-flowering plants like daffodils, tulips, crocus, and hyacinth are fall bulbs. Allium, scilla, anemones, and Asiatic lilies are planted in fall too. With a seasonal range of three months, when to plant fall bulbs is a question many gardeners struggle with.

Daffodils are a welcome sign in spring

Timely fall planting allows roots to develop before the ground freezes and prepares the plant for quick spring growth and flowering. If you plant too early the bulbs may use critical energy reserves and can begin to send up new shoots, exposing the young growth to winter kill. Prolonged exposure to warm, moist soil may promote fungal problems and rot. Plant too late and root growth may not be enough for the plant to flower properly.

To flower in spring, fall bulbs require exposure to cold temperatures. This chilling period triggers them to break dormancy when temperatures warm in spring. It's all about planting early and warm enough for the bulbs to begin developing, but late enough for them to stop developing shortly after to start soaking in the cold.

Tulip bulbs need to be planted in fall

There is no single right time for all gardeners. The proper time for planting fall bulbs may be September in Wyoming or North Dakota, October in Colorado or Kansas, November in Oregon or Nevada, and December in Virginia or North Carolina. Gardeners need to find out what's right for their individual gardens; one-size-fits-all advice from gardening books or magazines may lead to incorrect guidance.

Cooler soil temperatures are a primary indicator for proper planting time.  Ideally, soil temperature needs to be below 60F; a temperature of 55F degrees is perfect. The problem for the average gardener is that few gardens come with soil thermometers. As a guideline, soil temperatures usually cool to this target after a few weeks of nighttime temperatures regularly between 40 and 50.

There are also natural indicators that some gardeners use:

Plant just after fall foliage peaks
Plant when you no longer hear crickets at night
Plant when you see flocks of birds heading south
Plant when you regularly need a jacket to work in your garden
Plant the week after you smell your neighbor's fireplace for the first time
Plant when you have to turn your car heater on in the morning
Plant when your dog moves from the shade to the sun
Plant when your grapes are ripe
Plant on Columbus Day, Halloween, Veteran's Day, or Thanksgiving (depending on your zone)
Plant garlic on the first day of school
Plant after you blow out your lawn sprinklers

These suggestions are very unscientific and rely on local conditions that may not match your climate. But if you find a natural indicator that works for you, use it.

Some gardening experts recommend planting bulbs six weeks before a hard, ground-freezing frost. That's a little too hard to predict for many regions. If unseasonal warm weather lingers, bulbs may end up waiting in the ground for the cold to arrive for two months or more. That's much too early.

Planting within a few days of your average first frost date is a good guideline. That's what I typically use. The average first frost date means that historically half of first frosts occur before that date and half occur after. For me, that's the first week of October. By that time cool nights have cooled the soil but there are still enough warm days ahead to keep the soil warm enough for root development.

Check with local gardening experts for recommendations on planting fall bulbs. Diane Brunjes, Certified Colorado Gardener and the gardener for the Horticultural Art Society of Colorado Springs, recommends October planting versus September for our area too. In our climate, "It's too warm early in the season," she says. She's right.

A little too late is usually better than a little too early. There is a four to six-week target window for planting bulbs, but as long as you can still work in the soil it's probably not too late. Crocus, scilla, and snow drops do better planted earlier. Daffodils, hyacinth, and tulips can handle late planting. In fact, tulips can be planted in frozen ground and will probably still do fine.

Irises aren't true bulbs and do best planted in late summer or early fall

If you miss the ideal planting time and still have bulbs you purchased, plant them anyway. Most bulbs will dry out and be worthless if left to sit in their bag over the winter. They stand a chance of growing while in the ground. Plant them and hope for the best; you may be surprised by the results.

If you're still wondering when to plant your bulbs take a look around your garden. When you walk outside at night are you cold without a jacket? Have your pepper and tomato plants withered from frost? Are your raspberries fruiting? Are mum flowers drying on the plant? These are all signs that the season is changing and winter is coming. Don't delay too long. It may be the perfect time to put those bulbs in the ground.

“The simple answer is that bulb planting season starts once your soil temperature reaches about 55 degrees Fahrenheit,” says Tim Schipper of Colorblends, a Connecticut-based flower bulb wholesaler that sells direct to landcare professionals and home gardeners across the country.
“The problem is, who knows what their soil temperature is?” he adds.
Schipper knows that nature provides other indicators that tell us when conditions are just right for bulb planting. To him, fall planting season begins when nighttime temperatures average between 40°F and 50°F.
He recently asked his customers to share their own “natural guidelines.” Here are a few of their tips for knowing when it’s time to plant bulbs:
•    Fall foliage has moved just past peak
•    Crickets no longer chirp
•    Squirrels are digging in acorns as fast as they can
•    Birds start to group and depart
•    You start turning on the heat in your car
•    The air smells of wood smoke
•    Grapes are ripening on the vine
•    You blow out the irrigation system before the winter freeze
•    The hostas start to lie down
•    The air has that organic, decaying leaf smell
•    The dog moves from a cool to a sunny spot in the yard
•    The kids start putting on their jackets without being nagged by you
“Of course life doesn’t always go on schedule,” admits Schipper. “Though it’s not great to plant too early, you can usually get away with planting a bit late. Once soil temperature reaches the optimal level, you still have a six to eight week window to get bulbs in the ground before it freezes hard. So whether you forgot to order, or decide you want more, it’s generally not too late to buy and plant if you can still work the soil.”
- See more at: http://www.hortmag.com/weekly-tips/how-to-know-when-it-is-time-to-plant-bulbs?et_mid=639548&rid=236992853#sthash.VMChhMHB.dpuf

You can see my video demonstrating bulb planting on my video channel:
https://www.youtube.com/gardenerscott

“The simple answer is that bulb planting season starts once your soil temperature reaches about 55 degrees Fahrenheit,” says Tim Schipper of Colorblends, a Connecticut-based flower bulb wholesaler that sells direct to landcare professionals and home gardeners across the country.
“The problem is, who knows what their soil temperature is?” he adds.
Schipper knows that nature provides other indicators that tell us when conditions are just right for bulb planting. To him, fall planting season begins when nighttime temperatures average between 40°F and 50°F.
He recently asked his customers to share their own “natural guidelines.” Here are a few of their tips for knowing when it’s time to plant bulbs:
•    Fall foliage has moved just past peak
•    Crickets no longer chirp
•    Squirrels are digging in acorns as fast as they can
•    Birds start to group and depart
•    You start turning on the heat in your car
•    The air smells of wood smoke
•    Grapes are ripening on the vine
•    You blow out the irrigation system before the winter freeze
•    The hostas start to lie down
•    The air has that organic, decaying leaf smell
•    The dog moves from a cool to a sunny spot in the yard
•    The kids start putting on their jackets without being nagged by you
“Of course life doesn’t always go on schedule,” admits Schipper. “Though it’s not great to plant too early, you can usually get away with planting a bit late. Once soil temperature reaches the optimal level, you still have a six to eight week window to get bulbs in the ground before it freezes hard. So whether you forgot to order, or decide you want more, it’s generally not too late to buy and plant if you can still work the soil.”
- See more at: http://www.hortmag.com/weekly-tips/how-to-know-when-it-is-time-to-plant-bulbs?et_mid=639548&rid=236992853#sthash.VMChhMHB.dpuf

“The simple answer is that bulb planting season starts once your soil temperature reaches about 55 degrees Fahrenheit,” says Tim Schipper of Colorblends, a Connecticut-based flower bulb wholesaler that sells direct to landcare professionals and home gardeners across the country.
“The problem is, who knows what their soil temperature is?” he adds.
Schipper knows that nature provides other indicators that tell us when conditions are just right for bulb planting. To him, fall planting season begins when nighttime temperatures average between 40°F and 50°F.
He recently asked his customers to share their own “natural guidelines.” Here are a few of their tips for knowing when it’s time to plant bulbs:
•    Fall foliage has moved just past peak
•    Crickets no longer chirp
•    Squirrels are digging in acorns as fast as they can
•    Birds start to group and depart
•    You start turning on the heat in your car
•    The air smells of wood smoke
•    Grapes are ripening on the vine
•    You blow out the irrigation system before the winter freeze
•    The hostas start to lie down
•    The air has that organic, decaying leaf smell
•    The dog moves from a cool to a sunny spot in the yard
•    The kids start putting on their jackets without being nagged by you
“Of course life doesn’t always go on schedule,” admits Schipper. “Though it’s not great to plant too early, you can usually get away with planting a bit late. Once soil temperature reaches the optimal level, you still have a six to eight week window to get bulbs in the ground before it freezes hard. So whether you forgot to order, or decide you want more, it’s generally not too late to buy and plant if you can still work the soil.”
- See more at: http://www.hortmag.com/weekly-tips/how-to-know-when-it-is-time-to-plant-bulbs?et_mid=639548&rid=236992853#sthash.VMChhMHB.dpuf

Though they bloom in spring, flower bulbs that are planted in fall are known as "fall bulbs". Popular spring-flowering plants like daffodils, tulips, crocus, and hyacinth are fall bulbs. Allium, scilla, anemones, and Asiatic lilies are planted in fall too. With a seasonal range of three months, when to plant fall bulbs is a question many gardeners struggle with.

Daffodils are a welcome sign in spring

Timely fall planting allows roots to develop before the ground freezes and prepares the plant for quick spring growth and flowering. If you plant too early the bulbs may use critical energy reserves and can begin to send up new shoots, exposing the young growth to winter kill. Prolonged exposure to warm, moist soil may promote fungal problems and rot. Plant too late and root growth may not be enough for the plant to flower properly.

To flower in spring, fall bulbs require exposure to cold temperatures. This chilling period triggers them to break dormancy when temperatures warm in spring. It's all about planting early and warm enough for the bulbs to begin developing, but late enough for them to stop developing shortly after to start soaking in the cold.

Tulip bulbs need to be planted in fall

There is no single right time for all gardeners. The proper time for planting fall bulbs may be September in Wyoming or North Dakota, October in Colorado or Kansas, November in Oregon or Nevada, and December in Virginia or North Carolina. Gardeners need to find out what's right for their individual gardens; one-size-fits-all advice from gardening books or magazines may lead to incorrect guidance.

Cooler soil temperatures are a primary indicator for proper planting time.  Ideally, soil temperature needs to be below 60F; a temperature of 55F degrees is perfect. The problem for the average gardener is that few gardens come with soil thermometers. As a guideline, soil temperatures usually cool to this target after a few weeks of nighttime temperatures regularly between 40 and 50.

There are also natural indicators that some gardeners use:

Plant just after fall foliage peaks
Plant when you no longer hear crickets at night
Plant when you see flocks of birds heading south
Plant when you regularly need a jacket to work in your garden
Plant the week after you smell your neighbor's fireplace for the first time
Plant when you have to turn your car heater on in the morning
Plant when your dog moves from the shade to the sun
Plant when your grapes are ripe
Plant on Columbus Day, Halloween, Veteran's Day, or Thanksgiving (depending on your zone)
Plant garlic on the first day of school
Plant after you blow out your lawn sprinklers

These suggestions are very unscientific and rely on local conditions that may not match your climate. But if you find a natural indicator that works for you, use it.

Some gardening experts recommend planting bulbs six weeks before a hard, ground-freezing frost. That's a little too hard to predict for many regions. If unseasonal warm weather lingers, bulbs may end up waiting in the ground for the cold to arrive for two months or more. That's much too early.

Planting within a few days of your average first frost date is a good guideline. That's what I typically use. The average first frost date means that historically half of first frosts occur before that date and half occur after. For me, that's the first week of October. By that time cool nights have cooled the soil but there are still enough warm days ahead to keep the soil warm enough for root development.

Check with local gardening experts for recommendations on planting fall bulbs. Diane Brunjes, Certified Colorado Gardener and the gardener for the Horticultural Art Society of Colorado Springs, recommends October planting versus September for our area too. In our climate, "It's too warm early in the season," she says. She's right.

A little too late is usually better than a little too early. There is a four to six-week target window for planting bulbs, but as long as you can still work in the soil it's probably not too late. Crocus, scilla, and snow drops do better planted earlier. Daffodils, hyacinth, and tulips can handle late planting. In fact, tulips can be planted in frozen ground and will probably still do fine.

Irises aren't true bulbs and do best planted in late summer or early fall

If you miss the ideal planting time and still have bulbs you purchased, plant them anyway. Most bulbs will dry out and be worthless if left to sit in their bag over the winter. They stand a chance of growing while in the ground. Plant them and hope for the best; you may be surprised by the results.

If you're still wondering when to plant your bulbs take a look around your garden. When you walk outside at night are you cold without a jacket? Have your pepper and tomato plants withered from frost? Are your raspberries fruiting? Are mum flowers drying on the plant? These are all signs that the season is changing and winter is coming. Don't delay too long. It may be the perfect time to put those bulbs in the ground.

“The simple answer is that bulb planting season starts once your soil temperature reaches about 55 degrees Fahrenheit,” says Tim Schipper of Colorblends, a Connecticut-based flower bulb wholesaler that sells direct to landcare professionals and home gardeners across the country.
“The problem is, who knows what their soil temperature is?” he adds.
Schipper knows that nature provides other indicators that tell us when conditions are just right for bulb planting. To him, fall planting season begins when nighttime temperatures average between 40°F and 50°F.
He recently asked his customers to share their own “natural guidelines.” Here are a few of their tips for knowing when it’s time to plant bulbs:
•    Fall foliage has moved just past peak
•    Crickets no longer chirp
•    Squirrels are digging in acorns as fast as they can
•    Birds start to group and depart
•    You start turning on the heat in your car
•    The air smells of wood smoke
•    Grapes are ripening on the vine
•    You blow out the irrigation system before the winter freeze
•    The hostas start to lie down
•    The air has that organic, decaying leaf smell
•    The dog moves from a cool to a sunny spot in the yard
•    The kids start putting on their jackets without being nagged by you
“Of course life doesn’t always go on schedule,” admits Schipper. “Though it’s not great to plant too early, you can usually get away with planting a bit late. Once soil temperature reaches the optimal level, you still have a six to eight week window to get bulbs in the ground before it freezes hard. So whether you forgot to order, or decide you want more, it’s generally not too late to buy and plant if you can still work the soil.”
- See more at: http://www.hortmag.com/weekly-tips/how-to-know-when-it-is-time-to-plant-bulbs?et_mid=639548&rid=236992853#sthash.VMChhMHB.dpuf

You can see my video demonstrating bulb planting on my video channel:
https://www.youtube.com/gardenerscott

“The simple answer is that bulb planting season starts once your soil temperature reaches about 55 degrees Fahrenheit,” says Tim Schipper of Colorblends, a Connecticut-based flower bulb wholesaler that sells direct to landcare professionals and home gardeners across the country.
“The problem is, who knows what their soil temperature is?” he adds.
Schipper knows that nature provides other indicators that tell us when conditions are just right for bulb planting. To him, fall planting season begins when nighttime temperatures average between 40°F and 50°F.
He recently asked his customers to share their own “natural guidelines.” Here are a few of their tips for knowing when it’s time to plant bulbs:
•    Fall foliage has moved just past peak
•    Crickets no longer chirp
•    Squirrels are digging in acorns as fast as they can
•    Birds start to group and depart
•    You start turning on the heat in your car
•    The air smells of wood smoke
•    Grapes are ripening on the vine
•    You blow out the irrigation system before the winter freeze
•    The hostas start to lie down
•    The air has that organic, decaying leaf smell
•    The dog moves from a cool to a sunny spot in the yard
•    The kids start putting on their jackets without being nagged by you
“Of course life doesn’t always go on schedule,” admits Schipper. “Though it’s not great to plant too early, you can usually get away with planting a bit late. Once soil temperature reaches the optimal level, you still have a six to eight week window to get bulbs in the ground before it freezes hard. So whether you forgot to order, or decide you want more, it’s generally not too late to buy and plant if you can still work the soil.”
- See more at: http://www.hortmag.com/weekly-tips/how-to-know-when-it-is-time-to-plant-bulbs?et_mid=639548&rid=236992853#sthash.VMChhMHB.dpuf

“The simple answer is that bulb planting season starts once your soil temperature reaches about 55 degrees Fahrenheit,” says Tim Schipper of Colorblends, a Connecticut-based flower bulb wholesaler that sells direct to landcare professionals and home gardeners across the country.
“The problem is, who knows what their soil temperature is?” he adds.
Schipper knows that nature provides other indicators that tell us when conditions are just right for bulb planting. To him, fall planting season begins when nighttime temperatures average between 40°F and 50°F.
He recently asked his customers to share their own “natural guidelines.” Here are a few of their tips for knowing when it’s time to plant bulbs:
•    Fall foliage has moved just past peak
•    Crickets no longer chirp
•    Squirrels are digging in acorns as fast as they can
•    Birds start to group and depart
•    You start turning on the heat in your car
•    The air smells of wood smoke
•    Grapes are ripening on the vine
•    You blow out the irrigation system before the winter freeze
•    The hostas start to lie down
•    The air has that organic, decaying leaf smell
•    The dog moves from a cool to a sunny spot in the yard
•    The kids start putting on their jackets without being nagged by you
“Of course life doesn’t always go on schedule,” admits Schipper. “Though it’s not great to plant too early, you can usually get away with planting a bit late. Once soil temperature reaches the optimal level, you still have a six to eight week window to get bulbs in the ground before it freezes hard. So whether you forgot to order, or decide you want more, it’s generally not too late to buy and plant if you can still work the soil.”
- See more at: http://www.hortmag.com/weekly-tips/how-to-know-when-it-is-time-to-plant-bulbs?et_mid=639548&rid=236992853#sthash.VMChhMHB.dpuf