Tror ikke der er andet at gøre end at se tiden an. Husk at spørge under hvilke forhold de har groet inden du fik dem, så ved du hvor du skal holde dem indtil de er akklimatiseret.
Ikke noget med at vande dem endnu...
Husk at San pedro og peyote skal have vidt forskelligt medier. San pedro kræver næringsrig jord, hvor peyote kræver næringsfattig jord.
Begge sorter kræver meget godt drænet jord, da jorden skal tørre ud mellem vandingerne. Selv bruger jeg kompost og perlite 50/50% til voksne San Pedro; Ler og perlite 50/50% til voksne peyote, kokosfibre er også gode til peyote.
God fornøjelse med din nye hobby.
So you bought a beautiful cactus but you don't know how to care for it? Take a look at these pointers!
1) Don't over water your cactus
Don't over water your cactus, this is very important!
During the growth period of the cactus it needs to be watered more often than during the dormant period. As a general rule the plant is watered only when the soil has dried from the previous watering. Always make sure that the drainage holes in the pot are not blocked. During the dormant period (winter) the plants are watered only every few weeks, to keep them from shrivilling.
Over watering will cause the root and neck of the cactus to rot. When in doubt it's safer to wait a few days. Keep in mind that cacti have evolved to cope with long periods of drought and were not 'designed' to grow in soil that is constantly wet.
2) Put the cacti in a bright spot
Most cacti grow best when they receive at least a few hours of full sun each day during the growing season. This does not mean that they can not be grown on a north facing window but growth will slower and thinner. In any case they should be near to a window. Don't expect a cactus in the middle of a room to grow properly. Cacti that do not receive enough light will start to 'etiolate': they will strech and turn a lighter shade of green or even yellow/white in extreme cases. The etiolated region, that is much thinner than normal growth, will always remain visible as a thin ring of growth even when the cactus is grown in a bright spot afterwards. Do not put young seedlings directly in the full sun! If they turn purple they are receiving too much light.
3) Use a special cactus fertilizer
Liquid fertilizer should be used sparingly and only during active growth. Use a low nitrogen fertilizer like 5-10-10 (NPK) or similar every 2-3 months. Commercially available cactus fertilizer is just fine as are most fertilizers for flowering plants since these often contain only low levels of nitrogen.
4) Use a special cactus soil
Regular potting soils are not suitable for most cacti. These soils stay wet for too long and this promotes root and stem rot. In most countries special cactus soil can be bought in garden centers. Most of the soils work fine and are much better than standard potting soils.
5) Use the right pot
When repotting use a pot that is only a little larger than the current pot. If your cactus came without a pot, look at size of the rootball and use a pot that is slightly larger than the rootball (1 cm on each side and the bottom). A pot that is too big will lead to over watering and that will lead to rot. Pot should always have drainage holes so that excess water can run off. When choosing between clay or plastic pots, consider that plants in clay pots have to be watered twice as often as those in plastic pots. For beginners clay pots are preferrable because the soil dries faster and there is less chance of rot compared to plastic pots. Under very hot and sunny conditions clay pots may be unsuitable because they dry the soil too fast.
6) Water your cactus from the bottom
To prevent ugly spots on the stem and root neck cacti should preferrably be watered from the bottom. Put the cactus on a dish or similar and pour the water in the dish. The soil will absorb the moisture from below and this will keep the stem dry. Discard the leftover water (if any) after a few minutes. In any case never water from the top when the plants are in the full sun, this will surely lead to burns on the skin as the droplets work as small lenses concentrating the sunlight.
7) Watch out for pests
Mealy bugs are white/gray insects about 3 mm in length. Infected plants are often covered with wooly spots and are sticky with honeydew that is secreted by the mealy bugs. Small infestations be handled without pesticides, simply by removing them with tweezers, toothpicks or similar. An often recommended methods is to dab the insects with a cotton swab dipped in alcohol. We do not recommend this as the alcohol, if left to long on the plant, may lead to ugly spots.
Larger infestation may be treated with an insecticide. Stricly observe the safety instructions and local regulations concerning the use of insecticides.
Red spider mites are very small (0,2 mm) spider-like mites also feed on the sap of the plant. Misting the plants (not when the sun is shining!) works both as a preventive measure as a cure. Large infestations may need the application of an miticide. Stricly observe the safety instructions and local regulations concerning the use of miticides.

Don't disturb budding or flowering plants
If you want to enjoy flowers on your cactus you should not move or turn it during the formation of flower buds. Sudden shocks in environment may lead to the cactus dropping all buds.
9) Don't over water your cactus
Just to make sure that you don't forget: don't over water your cactus!
10) Relax
Don't sweat it, cacti are some of the most easy plants to care for. When in doubt wether to water, just don't. It would go too far to say that they thrive on neglect but there's a sence of truth in this.