Haworthia root cutting. (百合修根)
Today, fortunately, I've found two of my haworthia plants have withered roots. During hot summer, Haworthia have a very high chance to get withered roots. In this case, we have to cut those withered ones properly. So, what is the proper way to cut those roots? It's depends, but the general rules are:
1. Keep those strong white roots. (只保留白色粗壯根)

2. Cut anything until you see the pink heart. (Usually it is pink.) This is because the dead tissue will impede the growth of new roots. (清掉其他東西,直到你看到粉紅色的肉,不砍到肉,你的根很難發,也很難茁壯)

3. Sterilize it.(幫他消毒)
4. Wait it dried and go for rooting.  (等他乾燥發根)

Haworthia rooting by cuttings/leaf cuttings during hot summer-- Experiment 1.
(夏天百合科發根----實驗1).
1. Cut, disinfect and dry your haworthia(leaves). (剪下葉片or分枝)

2. Prepare the shells of the new generation cachapons and disinfect them.(消毒扭蛋殼備用)
3. Put clean tissue paper at the bottom as the hatching bed and then put the plant on it. After that, spray some rooting hormone water* on it.(用乾淨衛生紙當著床,噴灑發根水給直株與著床)

4. Stuff the egg with some warps. Do not overflowing the egg. Leave as many space as possible since we only need to fasten the plant.(用乾淨保鮮膜塞住植物不要讓他晃動)
5. Close it and make sure the plant has been fixed.(關起來,並確保植物不會晃動)

6. Put all eggs into a freezer bag and spray some rooting water again. Then, fasten it. Do NOT seal it.
(放到保鮮袋中,再噴點發根水,大概綁住,千萬不要密封)

7. Put it into your refrigerator for rooting.  (放到冰箱冷藏發根)
*I will not public the rooting hormone water ingredients unless I succeed.
(發根水配方目前不予公開,直到我確定成功)

Cotyledon tomentosa ssp. tomentosa  a.k.a Bear's Paw(熊童子)
A very adorable succulent species in the markets, has plump leaves with teeth at tips. Attractively, those teeth will become red or dark red if under sufficient bright sunlight and the temperature varies much from day to night. Unlike it's lazy appearance, the cultivation requires a little bit caution since during the wet hot summer (>30C) it will hibernate and sometimes lose it paws and during the cold wet long winter, it might lose it roots. Fortunately, the wild bear has been tamed by gardener selection. Select the bear with short plump and red paws and lignified stem to make sure you buy the robust  type. Do Not purchase no roots bear during hot seasons.
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Name:  Cotyledon tomentosa ssp. tomentosa  a.k.a Bear's Paw(熊童子)

Growing speed: Fast.

Cultivation difficulty: Moderate.

Shape: Graptopetalum: ovate and fuzzy

Color: Green with red or dark red teeth.

Hibernation: Hot season(Summer). Water with caution if temp> 30C and humidity >60%.

Culture medium: Well-drained soil.

Recommended:  Highly in cold and dry locations. Not recommended in wet and hot zones.

Purchase guide by observing leaves:

Type A: Highly recommended. Still growing under 35C.

Type B: Moderate. Relatively larger leaves but with obvious hibernation. Stop growing when temp > 32C.

Type C: Not recommended. The large long and thin leaves will lose paws when temp > 30C and easily get rotten roots when humidity > 60%

Graptoveria cv. Titubans(白牡丹)

Graptoveria cv. Titubans(白牡丹) is the cross specice of Graptopetalum paraguayense(瓏月/石蓮花) and Echeveria derenbergii (靜夜). A very beautiful succulent in the common market.
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Name:  Graptoveria cv. Titubans(白牡丹)

Growing speed: Fast.

Cultivation difficulty: Easy.

Shape: Graptopetalum 蓮花型,風車型

Color: White and pale green in normal time. Turn to white and pink under strong sun light.

Hibernation: Cold season(Winter) but not obvious.

Culture medium: Well-drained soil. (5% peat soil in hot wet locations, 25% for cold and dry locations)

Recommended:  Highly.

Here is a typical case of Haworthia hibernation Problem: The withered dried roots.
(Chinese speaker can use google translator, I've checked the result and it is correct. 中文使用者請使用google網頁翻譯)
Normally, gardener will adapt water rationing for those hibernating succulents to avoid rotten root, especially in hot and wet weather. However, a long period of water ration sometime causes problems. The root will dying due to the water shortage. Most haworthia plants will still need you to moisten the soil once a week to keep their root activation. Here is the case:
1. Apparently, there is no visible disease evidence. However, if your haworthia has become a little bit softer than before, you might need to pull it out for a check.(感覺比之前軟一點點)

2. Most of roots are dried. (soft and paper thin.)

3.Cut off those dried roots since they are already dead and spray some diluted bleach solution on it for sanitation. (probably 0.4-0.1%)

4. If the temperature is above 33C, you might need to pack it into a freezer bag with some small holes and let it sleep in the refrigerator(>4C) in the whole summer and regularly, spray some water once every 2 weeks depending on your refrigerator's capability.