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BE SURE TO COME ALONG TO OUR ANNUAL GENERAL

MEETING TO BE HELD ON THURSDAY, AUGUST 8th.

ALSO ON THIS NIGHT SLIDES WILL BE SHOWN

OF THE OTWAYS TRIP AND ALSO FROM LORD

HOWE ISLAND.

i****i********************i******

We thank Geoff for his detailed andwell explained study. A reportappears in other pages.

*iiit

"sggcial" Sggcial Effort

No competition was conducted at theJuly meeting. The special effort

competiti"“ will be resumed at the

August mee .9.

There will be nine prizes for the

competition, eight of which are rareexotic fern species whilst the ninthis a glazed ceramic pot stand in the

form of a turtle. The ferns are

donated by Chris Goudey and the pot

made and donated by Jean Trudgeon.

*****

S.G.A.P. Wildflower Show at Ringwood

Civic Centre:Vice-President Bill Taylor has onceagain undertaken to stage a display

of ferns on behalf of the Fern

Society. The show is to be stagedon the weekend of 10th and 11th

August, 1985. Bill needs help fromMembers who are prepared to lend

ferns for display and to take

supervision duty. Have a talk to

Bill about it at the August meeting.

Any help you can give will be

greatly appreciated.

*****

The Augggt_gggting:Thursday, 3th August, 1985 at

Burnley Horticultural College Hall

commencing at 8.00 p.m.

(a) Annual General Meeting

Agenda:

(i) Minutes of 1984 A.G.M.

(ii) To adopt a report on the

Committee's activities for

1984/85.(iii) To receive and adopt the

Treasurer's financialstatement.

(iv) To adopt the Committee‘s

recommendation for adding

some of the Society'sconstitutional rules asby-laws to the model rules

of Incorporation.

(v) Election of Office Bearers

for 1985/86.

(b) August General Meeting

I expect that all normal services

will operate after the Annual

Meeting as above. These include

“Special Effort" and "Fern Table“,

etc. The highlight of this meeting

will be a showing of slide

photographs describing plants, theirhabitats and scenes taken on Society

excursions to the Otway Ranges and

Lord Howe Island.

With kindest regards

DOUG THOMAS

"CONTROLLING THE ENVIRONMENT IN GREENHOUSES"

by Geoff Connellan

Meeting Report - 11th July, 1985

The main purpose in providing a glass or shade house for our plants is

to protect them from wind, rain, hail and frost. Also, we need to

create the right environment for plant growth.

There are three types of glasshouse in common use:

(i) unheated or cold;

(ii) heated (hothouse);

(iii) frost protection house (some heat).

The shapes of these vary through gable, flat, skillion, igloo and flat

arch; the material for making the frames may also vary between steel,

timber and a combination of both. Steel has the advantage of longersurvival.

Environmental control equipment which needs to be built-in would

include ventiliation in the form of ventilators and/or fans. Fresh

air is essential to the well being of the plants.

Cooling, especially in Summer, can be achieved by the installation ofshade cloth screens, shade paint or evaporative coolers. Geoff

prefers the knitted type shade cloth in preference to the wovenmaterial. He says it pulls tight very well but that both types givesimilar protection. 50% to 70% shade cloth density is adequate and

colour is not an important factor.

It is good idea to think about the types of plants, in this case,

ferns, that you want to grow. Do they come from climates which

average 10° C or 30°? If the latter, the climate inside the glass-house needs heating. A building without heat will get as cold as any

outside temperature. There is no escape from frost for plants housed

cold.

Heat can be provided by small electric fan heaters for frostprotection, or by using a double layer of the covering material, i.e.

solar plastic sheet, glass, etc. Double layering insulates against

day heat loss and frost. Gas heaters can also be used but these can

have toxic effects on ferns. Wood stoves are quite effective when

properly controlled.

It is better to heat tubes by gas and to introduce the heat into the

glasshouse through the tubes or pipes.

To assist ventilation use mesh on the bench shelves in preference to

solid materials. This allows for a gentle air movement around the

plants.

Humidity can be effectively supplied by use of a misting spray. Thiscan be achieved by using an inexpensive hand spray or a commercial

mist spray system.

Continued on next page

Continued from previous page

Good light is essential- for ferns. Sunlight produces a high level of

energy and even though plants do not use the full spectrum of sun-

light, ferns in particular will not thrive in deep shade. Hot summersun, however, needs to be controlled by shade paint or shade cloth.

Should artificial light be necessary, cool white lamps or fluorescent

tubes of the trade name "Grow Plant“ are recommended as being capableof covering most requirements. Incandescent globes are unsuitable.

Geoff explained that Burnley College is currently experimenting with a

solar application for greenhouses and a solar air heater wasillustrated.

Finally, Geoff demonstrated a variety of materials which are quitesuitable for greenhouse coverings. He recommended that Alsonite bechosen ahead of standard fibre glass because of the preservative

coating on its surfaces. Alsonite has a longer life expectancy than

uncoated fibre glass. Geoff said that the most efficient colours are

white, clear and opal. Avoid all the rest.

Keith Hutchinson ably moved a vote of thanks to Geoff on behalf of

Members. This was carried with sustained acclamation.

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(continued from the July issue)

4. Planting

Choosing the fern species for planting into the soil mixture provides

us with an endless source of interest and delight. For those who are

setting up a terrarium for the first time and would prefer to advance

cautiously, may I suggest Doodia caudatum (small rasp fernhAspleniums (any of the small species), Lastreopsis hispida (Bristly

shield fern), Doryopteris species and some Selaginellas (fern alliesL

The planting of the bulbils of several fern species often results in

spectacular success. Bulbils of Hemionitis palmata (Mexico) occur onthe face of the palm shaped fronds and develop into pretty little

plants in the terrarium. of similar structure is the Doryopteris

genus which also does well. Adiantum reniforme is worth a try.

Arrange the species so that the tallest are placed at the back and

shorter species graduate to the shortest at the front. Keep in mind

that Selaginellas grow quickly in the terrarium and some species tendto dominate and become a little rank.

5. Maintenance

When planting and on occasions when the glass cover has to be lifted

or opened, make sure that you close any doors which lead into the area

where the terrarium is placed. Never take the risk of allowingprecious moisture and humidity to be drawn off by draughts. Humidityis essential to success; the moisture in the original mixture and

drainage material is sufficient to maintain the plants for monthsproviding the case is not opened. If drying out does occur in hot

weather, introduce moisture by use of a hand mist spray. Use boiled

water in the mist spray.

Should you feel that a top dressing of mulch is needed, sterilise themulch before applying.

Don't be disappointed if your terrarium becomes exhausted aftereighteen months or so. Accept that it is so, clean out the case and

set it up again. Don‘t ever use organic fertilisers.

The fluorescent light need not be switched on during the day. Acouple of hours early in the morning and two or three hours aftersunset is usually enough artificial light. There is one exception

however; the light should be switched on whenever you have visitors.

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