Many of us have to bring cacti indoors for winter to protect them from the cold. While this is necessary in many cold winter climates, by doing so, we may be creating conditions where cactus won’t bloom. Too much water, too much heat, and not enough bright light provide reasons that answer “why doesn’t my cactus flower?”
Reasons a Cactus Won’t Bloom
The type of cactus you grow may actually be unable to produce flowers for many decades. 50 to 100 years is not uncommon for cactus bloom times on certain varieties. If you desire ready flowering indoor cactus, choose from the following types:
- Gymnocalycium
- Notocactus
How to Get a Cactus to Bloom
When keeping cactus indoors during winter, try to locate
them in the coolest spot. While they likely won’t survive outdoors below 20
degrees F. (-6 C.), they do need a chilling period to bloom. Also, keep in mind,
if they are outside in temps this cold, they must stay completely dry. Indoor
cactus doesn’t need water during the winter either. Withhold all water during
their period of dormancy, waiting for signs of growth to resume watering. This encourages
flowering.
At this time, if you’ve not already positioned your cacti in
a full sun position, this is a great way to get blooms. Full morning sun is
best, with the exception of jungle/forest cacti that can take dappled sun or
just bright light.
Cacti, as with other plants, should be gradually acclimated
to the sun so they don’t get a sunburn.
Begin with an hour or two and increase weekly for desert cactus, until your
plant is getting at least six hours of sun daily. An indoor lighting system may
work if actual sunshine is not available. However, if you can move the plant
outdoors when temperatures warm, do so.
When you start watering again, you may also lightly feed
with a high phosphorous fertilizer. Use it at half strength, watering first. If
you have fertilizer already on hand, check the fertilizer ratio and make sure
the middle number is highest. Nitrogen fertilizer (first number) is not good
for cactus and succulents, as it creates weak and spindly growth, so avoid this
when possible. High phosphorous fertilizer is sometimes labeled as “Bloom
Buster.”
Following this regime, when do cacti flower? Late spring or
summer for some, while others may not blossom until winter. Remember, don’t
expect blooms until your plant is mature. Google the type of cactus you have to
learn more about its age at first bloom.
Now that you’ve learned how to get a cactus to bloom, you
can proceed with getting flowers on those mature plants that have not yet
flowered. Enjoy the show!
Many of us have to bring cacti indoors for winter to protect them from the cold. While this is necessary in many cold winter climates, by doing so, we may be creating conditions where cactus won’t bloom. Too much water, too much heat, and not enough bright light provide reasons that answer “why doesn’t my cactus flower?”
Reasons a Cactus Won’t Bloom
The type of cactus you grow may actually be unable to produce flowers for many decades. 50 to 100 years is not uncommon for cactus bloom times on certain varieties. If you desire ready flowering indoor cactus, choose from the following types:
- Gymnocalycium
- Notocactus
How to Get a Cactus to Bloom
When keeping cactus indoors during winter, try to locate
them in the coolest spot. While they likely won’t survive outdoors below 20
degrees F. (-6 C.), they do need a chilling period to bloom. Also, keep in mind,
if they are outside in temps this cold, they must stay completely dry. Indoor
cactus doesn’t need water during the winter either. Withhold all water during
their period of dormancy, waiting for signs of growth to resume watering. This encourages
flowering.
At this time, if you’ve not already positioned your cacti in
a full sun position, this is a great way to get blooms. Full morning sun is
best, with the exception of jungle/forest cacti that can take dappled sun or
just bright light.
Cacti, as with other plants, should be gradually acclimated
to the sun so they don’t get a sunburn.
Begin with an hour or two and increase weekly for desert cactus, until your
plant is getting at least six hours of sun daily. An indoor lighting system may
work if actual sunshine is not available. However, if you can move the plant
outdoors when temperatures warm, do so.
When you start watering again, you may also lightly feed
with a high phosphorous fertilizer. Use it at half strength, watering first. If
you have fertilizer already on hand, check the fertilizer ratio and make sure
the middle number is highest. Nitrogen fertilizer (first number) is not good
for cactus and succulents, as it creates weak and spindly growth, so avoid this
when possible. High phosphorous fertilizer is sometimes labeled as “Bloom
Buster.”
Following this regime, when do cacti flower? Late spring or
summer for some, while others may not blossom until winter. Remember, don’t
expect blooms until your plant is mature. Google the type of cactus you have to
learn more about its age at first bloom.
Now that you’ve learned how to get a cactus to bloom, you
can proceed with getting flowers on those mature plants that have not yet
flowered. Enjoy the show!