Steve Howard’s September Australian Epiphytes and Terrestrials Orchids Cultural Notes for Adelaide’s conditions.
Mounts daily. Generally moistening roots only.
Pots weekly. Small pots twice weekly depending on weather.
Pots can dry out faster on warmer days so keep a watch on conditions. Note some terrestrials will commence summer dormancy towards the end of the month. Those that do show signs can have water reduced somewhat.
Weak organics like Seasol and Powerfeed applied in low doses can benefit colony type greenhoods.
Low nitrogen always best for native epiphytes. Top up epiphyte pots with dolomite lime and a dash of blood and bone. Seasol a useful additive now as new seasons root start.
Pests and Disease
Botrytis will rot new buds in cold damp weather as fast as it attacks new growths from now. Aphids will increase sharply this month and favour new growth and spikes. Pyrethrum sprays eco friendly and work well, so does a hose but dry spike straight after.
Some terrestrials will rot this month if conditions have been too wet or stagnant over winter. Note this for next season and add more drainage if this has been an issue.
Keep flowering plants under cover to enjoy as can be rather wet and cold as well sunny and warm this month. Start repotting and division once flowering finished to give plants longest possible time to establish over new growing season.
Time to get busy and take note of the jobs of potting and division to be done. Sept and October are the best months to work on the collection before the hot weather sets in.
Do you have small slugs and snails in your pots? Get a cheap coffee grinder and grind up your snail pellets. Sprinkle in the pot and water them in. Bite size for micro slugs and the baits get right into where they hide.
[Terrestrials are not repotted until summer – Steve will have more on that later]