Small Opuntia seedlings

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AndrewB
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Small Opuntia seedlings

Post by AndrewB » Sat Jan 02, 2021 1:22 pm

Hi,

Over the last few years I have tried to germinated and grow some small Opuntia seed, the following photos show some of the results. Some are looking a bit shrivelled - dormancy and no nutrition since September, I also transplanted them mid growing season which contributed!
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Andrew

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ralphrmartin
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Re: Small Opuntia seedlings

Post by ralphrmartin » Sat Jan 02, 2021 1:43 pm

I'd be (gently) watering those smallest ones through their first winter.
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Re: Small Opuntia seedlings

Post by AndrewB » Sat Jan 02, 2021 2:03 pm

Hi Ralph,

I don’t water during the winter, they never seem to absorb it, even on the sunniest days.
Andrew

40+ year’s interested in cacti. Now includes most genera of small to medium ‘globular’ cacti, large flowering Mammillaria, Epiphyllum, Trichocereus, Hildewintera, Cleistocactus etc, small Agaves, Lithops, Titanopsis, Faucaria etc, plus hybridising.
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Mike P
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Re: Small Opuntia seedlings

Post by Mike P » Sat Jan 02, 2021 3:31 pm

I find Maihuenia seedlings are very prone to desiccation even in winter and would risk a few drops of water especially if they are in a heated greenhouse.
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ralphrmartin
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Re: Small Opuntia seedlings

Post by ralphrmartin » Sat Jan 02, 2021 4:41 pm

AndrewB wrote:
Sat Jan 02, 2021 2:03 pm
I don’t water during the winter, they never seem to absorb it, even on the sunniest days.
It's hard to see, as everything happens so much slower at low temperatures - but the cacti I water in winter definitely seem more ready to start growing in spring than ones kept bone dry. It may help them retain their roots.
Ralph Martin
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Members visiting the Llyn Peninsula are welcome to visit my collection.

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Re: Small Opuntia seedlings

Post by Darren S » Sat Jan 02, 2021 6:14 pm

I was going to say the same as Mike - the Maihuenia in particular like a little water.
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Re: Small Opuntia seedlings

Post by AndrewB » Sat Jan 02, 2021 10:54 pm

Thanks for your advice.

I have ended up with plants getting dripped on when it rains during the winter. The results have usually been shrinking of the plant, presumably dilution of stored nutrients and not surviving the spring start. This winter I did get a couple of seedlings actually grow from the accidental deluge, but it seems the exception rather than the norm.

As it’s only two months until March, I shall wait until a decent sunny period in early spring.
Andrew

40+ year’s interested in cacti. Now includes most genera of small to medium ‘globular’ cacti, large flowering Mammillaria, Epiphyllum, Trichocereus, Hildewintera, Cleistocactus etc, small Agaves, Lithops, Titanopsis, Faucaria etc, plus hybridising.
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Re: Small Opuntia seedlings

Post by Pattock » Sat Jan 02, 2021 11:03 pm

Maihuenia is a very different creature, in its own subfamily of the Cactaceae, not an opuntia and from a quite wet area. Not to be confused with Maihueniopsis which is an opuntioid.
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Re: Small Opuntia seedlings

Post by AndrewB » Sat Jan 02, 2021 11:56 pm

It’s the Maihuenia darwinii v hickenii and T.alexanderi ssp bruchii that are the most shrunk at the moment. The Maihueniopsis still seem to even have turgid leaves.

But as you say, it’s not an Opuntioid, but is closely related according to cladistics.
Andrew

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Re: Small Opuntia seedlings

Post by Pattock » Sun Jan 03, 2021 1:13 am

You mean Maihueniopsis darwinii? That is an opuntioid.
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