Ask a Question forum→How much water for a repotted fairy castle cactus

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Name: Cat
New York
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SerenityDream
Apr 19, 2021 7:27 PM CST
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Hello,
I am trying to figure out how much water to give my Fairy Castle Cactus (Acanthocereus Tetragonus).

My last fairy castle cactus died from over-watering so I do not want to repeat that same mistake.

As you can see from the photo...I purchased a cactus in a tiny plastic pot, with fake flowers (which I have removed), and I repotted it into a clay pot with a drainage hole. I repotted it in the soil featured in the photo, which advertises good drainage and also has fertilizer.

Up until now, I have been watering it 2 tsp once a month, but that was during the colder months and before repotting.

As you can see from the photos, it seems to have grown a bit! :)

I watered it with 2 tsp this evening, around the edges of the soil, but the soil still looks super dry. I don't want to commit the cardinal sin of overwatering, so any info (in measurements...cups, Tbsp, tsp etc.) would be very helpful. Thanks in advance!

[Last edited by SerenityDream - Apr 19, 2021 7:34 PM (+)]
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Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Apr 19, 2021 9:11 PM CST
Welcome!

Your new pot should be just larger than the root ball so your cactus is overpotted and overwatering will be more of a problem. The pot it came in was probably the right size. Did the roots completely fill the pot?

2 tsp is not watering, its teasing. How long ago did you repot? If its been more than a week, water the soil until some water drips out the bottom of the pot. Then put it in your sunniest window and don't water again until the soil is completely dry. You can check that by pushing a bamboo skewer into the soil to the bottom of the pot, leaving it for a minute and pulling it out. Feel the skewer. If there is any dampness, don't water.

It could take a couple weeks to dry because the pot is very large and will hold more water than the cactus can use.

If you just repotted in the last couple weeks, I would consider repottng to a smaller pot (just larger than the root ball).
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

President: Orchid Society of Northern Nevada
Webmaster: osnnv.org
Name: Cat
New York
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SerenityDream
Apr 21, 2021 11:01 AM CST
DaisyI said: Welcome!

Your new pot should be just larger than the root ball so your cactus is overpotted and overwatering will be more of a problem. The pot it came in was probably the right size. Did the roots completely fill the pot?

2 tsp is not watering, its teasing. How long ago did you repot? If its been more than a week, water the soil until some water drips out the bottom of the pot. Then put it in your sunniest window and don't water again until the soil is completely dry. You can check that by pushing a bamboo skewer into the soil to the bottom of the pot, leaving it for a minute and pulling it out. Feel the skewer. If there is any dampness, don't water.

It could take a couple weeks to dry because the pot is very large and will hold more water than the cactus can use.

If you just repotted in the last couple weeks, I would consider repottng to a smaller pot (just larger than the root ball).


I repotted it because it came in a plastic pot. It *looked* crowded to me, but what do I know? *lolol* (I'm new to this :P). In hindsight, a smaller pot would've been better (that was all they had at the farm market). I found a pot in between what it came in, and what it is in now. The cactus was repotted almost exactly a month ago. Is it too late to repot? (Carefully). I am concerned about overwatering if I keep it in a pot that big.
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Apr 29, 2021 6:21 PM CST
Does the pot have a drainge hole?

Find a spot with better light. Do you see how the newest leaf is smaller than the older leaves? That is caused by insufficient sunshine.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

President: Orchid Society of Northern Nevada
Webmaster: osnnv.org
Name: Cat
New York
Image
SerenityDream
Apr 30, 2021 4:59 AM CST
DaisyI said:Does the pot have a drainge hole?

Find a spot with better light. Do you see how the newest leaf is smaller than the older leaves? That is caused by insufficient sunshine.


Yes, the new pot has a drainage hole, but it came with a little plastic mesh attachment. I used it because, based on what I read in my cacti book, I figured it was to prevent weed growth. And thank you for the info! This spot is the only aesthetic place that gets enough sunlight (the photo was taken at night). However, during the day I could leave it in the other window for some odd hours...How many hours would you recommend? That window gets full sunlight.
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Apr 30, 2021 10:24 AM CST
Forever! The more indoor sun the better it will grow.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

President: Orchid Society of Northern Nevada
Webmaster: osnnv.org

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