There are similar conditions here in Czech Republic and I have most of my plants on eastern balcony under a shade net. I mist them daily before hottest part of the day and they grow just fine.

There's a WHOLE lot of information to be gained reading prior post. Start there.

Hi everyone.

Daniel - Firstly let me say I'm not a Tilly grower, but I know a lot of growers who are, and during my association and discussions with them I have picked up some basic cultural tips
on growing Tillandsias which can be summarised into the two most important cultural requirements; sufficient water and adequate light.

Let me further add that I live on the South East Coast of N.S.W. Australia as do my brom growing friends and the plants I am discussing all grow outside in a temperate climate, so I don’t know if these tips would apply the same to other countries or to plants grown inside
the home or not. However other growers with cultural conditions similar to yours are free to comment and correct me if my comments don’t apply to your situation.

My understanding is that Tillandsias come in basically two different types; the “green leaf type” and the “grey/silver leaf type” and your Tillandsia ionantha belongs to this second group and this is what I’ll talk about.

This "grey/silver leafed type" is the one commonly referred to as "air plants" because they'll grow mounted on something or simply suspended while attached to a bit of suitable wire or fishing line or similar (AS LONG AS IT ISN'T COPPER), and they thrive on abundant circulating air and a minimum of water. If your plant is in a position to get plenty of circulating air, and you do happen to over-water, this circulating air will quickly help to dry up the excess water and this is why access to abundant movement of air is so vital.

There is a general well-known fact for all plants; and that is, more plants are killed from
over-watering than under-watering - If you can't decide if a plant needs watering or not, leave it for a few more days before you water it rather than take the chance of over-watering.

I’ve been told by Tillandsia growers that the best way to judge your Tillandsia’s water requirements is by the foliage colour; with plants such as yours, if it is silvery/grey all is OK;
if it is leaning toward mostly green, this means it's getting too much water, and if it’s grey and bordering on white (sometimes with burnt leaf tips) this means it is under-watered, so you need to “read your plant” and look at the signs to help you decide its water requirements.

The other important cultural requirement is the degree of light these plants are exposed to. Generally speaking, good light will give good foliage colour and aid in the production of flowers, whereas, too little light will produce foliage tending more toward green in colour and the production of flowers will be poor in most cases.

Once again you can be guided by the foliage colour of your plants, if they are that silvery/grey colour the light is adequate, if the foliage is leaning more toward green, the
degree of light needs to be gradually increased.

Below are two links to sites which will provide more “in depth” cultural information which I think will also help you to grow your Tillandsias.

http://www.bromeliads.info/tillandsia-bromeliad/

http://www.learn2grow.com/gardeningguides/houseplants/indoorfoliage/airplants.aspx

All the best, Nev.