Posts: 12811
Joined: Tue Jan 01, 2013 8:32 am
Location: hawaii, zone 12a 587 ft elev.

Choosing the right container for the plant

A rule of thumb of choosing what size of container to use

Seeds, seedlings or starts = seed trays, community pots, or 4-6 inch pots

Cactus, succulents, orchids and other very slow growing plants = select a pot that breathes. like clay or concrete, or put extra holes in the sides of plastic pots. Select a pot that just accommodates the roots with 1-2 inches of room to spare to accommodate 1-2 years' growth.

mature plants under 12 inches = 1 gallon

plants 2-3 ft = 5 gallon

plants over 3 ft = 18 gallon or 20-24 inch pots

Shallow rooted = select a pot that is wider than it is deep.

Basic soil mix
1 part peat moss
1 part perlite
1 tablespoon of slow release fertilizer (osmocote, nutricote) per gallon of mix

Soil mix for wet plants
1 part peat
1 part compost
1 part vermiculite
1 part perlite
horticultural charcoal in small amounts
1 tablespoon slow release fertilizer per gallon of mix

Orchid mix
1 part NZ bark
1/4 part large perlite
dusting of dolomite lime
slow release fertilizer 1 tsp per pot

Orchid Mix 2
Med size black cinder or no. 3 blue rock
1 tsp slow release fertilizer per pot

Orchid Mix for vandas and rootless orchids
Small clay pot or basket that just keeps the plant upright
Styrofoam to wedge plant in place
tie wire to tie plant to basket.
No media
Tie vanda to basket to keep it upright, Wedge with one or two pieces of large styrofoam to keep plant stable. Hang it up and water daily
To save rootless cuttings =
place cuttings or bulbs in a clean pot with a little loose sphagnum pot at the bottom. Pot should just be large enough to keep the plant upright. Water as needed transplant when roots 1/2 inch long
Oncidiums, vandas, catleya, and bromeliads can be grown in pots without media. Plants need to be wedged in place by selecting a pot small enough to just hold them upright and wedging the plant with pieces of broken pots or styrofoam. Water lightly daily and use water soluble fertilizer.

Succulents, orchids, anthuriums, citrus trees will grow well in cinder. Cinder provides good aeration, but no nutrients so regular fertilization and water is required. Cinder is heavy, so do not plan to move pots often unless they are on dollies.

Greener Thumb
Posts: 1335
Joined: Tue Mar 06, 2012 1:25 am
Location: ranches in sierra nevada mountains California & Navada high desert

Re: Choosing the right container for the plant

Hi, Sounds good! I have to admit, I'm not sure what cinder is. Is it ground up lava, where you are?


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