• The Best Fall-Planted Bulbs For Dry Areas

 

By David Salman, Chief Horticulturist

Spring-flowering bulbs are a unique group of pollinator-friendly flowers that have been a staple of gardening in Europe and the U.S. for many years. These fall-planted, flowering plants are easy additions to our landscapes. They light up the spring garden before many other plants wake up and come into flower, providing essential early season nectar for bees and other pollinators.

Fall-planted bulbs, such as the Drumstick Allium (Allium sphaerocephalon) pictured above, bloom in the spring and provide essential early season nectar for bees and other pollinators.Fall-planted bulbs, such as the Drumstick Allium (Allium sphaerocephalon) pictured above, bloom in the spring and provide essential early season nectar for bees and other pollinators.
Fall-planted bulbs, such as the Drumstick Allium (Allium sphaerocephalon) pictured above, bloom in the spring and provide essential early season nectar for bees and other pollinators.

Tips For Growing Fall-Planted, Spring-Flowering Bulbs

Spring-flowering bulbs depend on two climatic factors to do well in our landscapes:

  1. Cold winter temperatures. Fall planted, spring blooming bulbs need many hours below 40° F to bloom. For warm zones where winter temperatures do not reach freezing, you can pre-chill bulbs before planting in spring.
  2. Good winter and spring moisture. Spring precipitation helps bring them back into active growth and flowering.

 

Many gardeners want to know if spring-blooming bulbs are good waterwise (xeric or drought resistant) plants for drier growing conditions. The answer depends on where you are in the U.S:

  • In parts of the country that get 30" or more annual rainfall, bulbs generally will not need any additional irrigation, unless winter snow cover is thin and spring conditions are unusually dry.
    • In the Western U.S., where there isn't as much rainfall (20-25" or less anually), most bulbs will need some supplemental irrigation. Where snow coverage is unpredictable and spring rains erratic, it is essential that beds where bulbs are planted be watered every week to two weeks to keep the soil moist to a depth of 6-12".
  • In higher elevation areas where winter/early spring snows leave the soil moist, bulbs will only need extra water if conditions are unusually dry.

Mulching is an essential technique for growing bulbs in drier climates. A nice 1-2" deep blanket of coarse compost, composted bark, or other non-gravel material applied in late fall will conserve soil moisture, and enrich the soil as it decomposes.

When fall-planted bulbs receive sufficient moisture and cold temperatures over the winter and during early spring months, there is little else we need to do to keep them happy. They only need nutrients and space to grow. Here are a few long-term maintenance tips for growing spring flowering bulbs:

  • Feed the soil where bulbs are growing with organic and natural fertilizers in mid-spring.
  • Divide bulb clumps that are blooming sparsely. Dig them up in the fall and pull apart tightly clustered bulbs; then re-plant after enriching their soil.
  • After blooming, spring-flowering bulbs have already adapted to hot, dry summer conditions by going dormant in summer. They shed their foliage by early summer or earlier, resting underground as a "sleeping" bulb. Only trim foliage after it has yellowed, to allow the bulb to "recharge" for next season's blooms.
Muscari armeniacum (Grape Hyacinth) is a fall-planted bulb recommended for dry or drought conditions, and its 1" flower clusters start blooming late spring and continue into early summer.Muscari armeniacum (Grape Hyacinth) is a fall-planted bulb recommended for dry or drought conditions, and its 1" flower clusters start blooming late spring and continue into early summer.
Muscari armeniacum (Grape Hyacinth) is a fall-planted bulb recommended for dry or drought conditions, and its 1" flower clusters start blooming late spring and continue into early summer.

Our Top Picks For Fall Planted Bulbs In Dry Areas

With sufficient extra irrigation: most fall bulbs will do well in drier climates. Large flowered TulipsDaffodilsScillaHyacinths, and most other fall-planted bulbs are good to plant.

For landscapes that have limited water available for irrigation: The spring flowering bulbs listed below are the most tolerant of dry soil. In areas that get 15-20" or less of annual precipitation, even these more xeric bulbs will need supplemental spring watering of 2" or more per month once the soil thaws.

 
Shop All TulipsShop All Tulips
Tarda Wildflower Tulip

Wildflower Tulips

Allium (Ornamental) & Lavender - two purple flowers planted in the gardenAllium (Ornamental) & Lavender - two purple flowers planted in the garden
Allium & Lavender

Alliums | Ornamental Onions

Harmony Specie IrisHarmony Specie Iris
Harmony Specie Iris

Specie Iris (Mini Iris)

Jessie Spring StarflowerJessie Spring Starflower
Jessie Spring Starflower

Starflower | Ipheion

A Crocus LawnA Crocus Lawn
A Crocus Lawn
Camas LiliesCamas Lilies
Camas Lilies

More Unique Bulbs For Dry Areas

by High Country Gardens

Best Fall-Planted Bulbs For Dry Areas
Fall-planted bulbs, such as the Allium sphaerocephalon pictured above, bloom in the spring and provide essential early season nectar for bees and other pollinators.

Xeric Bulbs

Spring-flowering bulbs are a unique group of pollinator-friendly flowers that have been a staple of ornamental gardening in Europe and the U.S. for many years. These fall-planted, flowering plants are low-care additions to our landscapes, and they light up the spring garden before many other plants wake up and come into flower, providing essential early season nectar for bees.

Necessities for Successful Spring-Flowering Bulbs

Spring-flowering bulbs depend on two climatic factors to do well in our landscapes:

  1. Cold winter temperatures — sufficient hours below 40° F (Seek out low chill or pre-chilled bulbs for Zones 9 & 10).
  2. Good winter and spring moisture to bring them back into active growth and flowering.

After blooming, spring-flowering bulbs have already adapted to hot, dry summer conditions by going summer dormant (shedding their foliage by early summer or earlier) and resting underground as a "sleeping" bulb.

Other Maintenance For Long Term Success

When fall-planted bulbs receive sufficient moisture and cold temperatures over the winter and during early spring months, there is little else we need to do to keep them happy. They only need nutrients and space to grow.

  • Feed the soil where bulbs are growing with organic and natural fertilizers in mid-spring.
  • Divide bulb clumps that are blooming sparsely. Dig them up in the fall and pull apart tightly clustered bulbs; then re-plant after enriching their soil.

How Much Moisture is Enough?

Much attention has been directed toward drought conditions this summer in California and the Pacific Northwest. And gardeners want to know if spring-blooming bulbs are good waterwise (xeric or drought resistant) plants for drier growing conditions. The answer depends on where you are in the U.S. For many parts of the country that get 30" or more of precipitation annually, bulbs generally will not need any additional irrigation, unless winter snow cover is thin and spring conditions are unusually dry.

In the Western U.S. where there isn't as much rain and snow (20-25" or less), most bulbs will need some supplemental irrigation.

  • In higher elevation areas where winter/early spring snows leave the soil moist, bulbs will only need extra water if conditions are unusually dry.
  • Where snow coverage is unpredictable.and spring rains erratic, it is essential that beds where bulbs are planted be watered every week to two weeks to keep the soil moist to a depth of 6-12".

Mulching is an essential technique for growing bulbs in drier climates. A nice 1-2" deep blanket of coarse compost, composted bark, or other non-gravel material applied in late fall will conserve soil moisture and enrich the soil as it decomposes.

Fall Bulb Varieties That Tolerate Drier Conditions

Muscari armeniacum (Grape Hyacinth) is a fall-planted bulb recommended for dry conditions.
Muscari armeniacum (Grape Hyacinth) is a fall-planted bulb recommended for dry or drought conditions, and its 1" egg-shaped flowers start in late spring and continue into the summer.

With sufficient extra irrigation, most fall bulbs will do well in drier climates. Large flowered Tulips, Daffodils, Scilla, Hyacinths, and most other fall-planted bulbs are good to plant.

For landscapes that have limited water available for irrigation, the spring flowering bulbs listed below, along with any of the Starflowers (Ipheon), are the most tolerant of dry soil. In areas that get 15-20" or less of annual precipitation, even these more xeric bulbs will need supplemental spring watering of 2" or more per month once the soil thaws.

Tulips
Grape Hyacinth
Ornamental Onions (Allium)
Cammas Lily

Camassia quamash bulbs like it moist during the spring (planted in low spots or moist areas) and bone dry over the summer. It is an excellent xeric species for the Pacific Northwest where it is native.

Crocus
Squill
Dwarf Iris
Lebanon Squill Puschkinia libanotica bloom in early to mid-spring.
The ice-blue flowers of Lebanon Squill (Puschkinia libanotica) bloom in early to mid-spring. An excellent naturalizing species and perfect companion for Daffodils, it thrives in sun to partial shade and will naturalize and spread gently once established.

Text by David Salman.

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