For PvE healing, you won't be able to roll triple-stacks of life-bloom on more than one target, because you'll spam yourself OOM without doing enough Hit Points to be worthwhile to your raid. So, these life-bloom strategies are intended for one tank target, in addition to using regrowth, your other HoTs and nourish on a tank.
   There are five strategies for tank healing with life-bloom.
   The first strategy is traditional rolling life-bloom triple-stacks. This is the strategy most healers have been using life-bloom for. What you do is to get three life-blooms on the target and then refresh it before it falls off the target. If you have enough mana to do this, you'll get the maximum healing out of life-bloom. However, 800 mana for life-bloom, it costs 800×3 = 2400 mana to get the first three stacks up, and then an additional 800 mana every 9 or 10 seconds to maintain it. Over the course of one minute, this strategy will cost you: 2400 mana + 4800 mana= 7200 mana. This is only the mana cost associated with rolling the life-bloom. It doesn't factor in any of the other spells you'll cast during that minute, but 7200 mana is lots of mana to maintain life-bloom stacks. You can reduce this mana cost through talents and items that reduce the cost of your spells.
But you don't use this strategy if you're running OOM too early in the fight. If you aren't running OOM and seem to have enough mana to spare, you can still roll 3X life-blooms, it's just not be all end all heal that it once was.
   The second strategy is slow applying the triple-stack rolling life-bloom. Instead of stacking life-bloom at the beginning of the pull, you slowly stack it. Then, you can maintain that stack over the course of the fight. If life-bloom costs 800 mana, this saves you 1600 mana up front compared to the strategy one.
   The third strategy is slow rolling and let it fall off at 3. This is the strategy for you if you have the T7 bonus and glyph of nourish. It doesn't have the more constant healing that A and B have, but it maximizes the mana regeneration while doing the most HoT healing. How it works: Slowly stack it like strategy B. Once it has 3 stacks, let it bloom and return mana to you. Then, slowly stack it over time again; let it fall off after third application. Rinse and repeat. You also have the downside of it always having a huge triple bloom at times you can't control that will likely mostly go to over-healing, as you aren't timing that big bloom. Remember that you let it fall off for mana regeneration purposes, not because you get a bloom. If life-bloom costs 800 mana, one minute of casting costs only 2400 mana.
   The fourth strategy is cast it once and let it bloom. You don't bother maintaining stacks at all. Just wait for it to fall off and bloom, then cast it again. Wait for it to bloom. Cast it again. You get a lot of little blooms across the course of the raid, the full benefit of the mana return, it buffs your nourish, but never does very much healing on its own. Otherwise, you should use one of the other strategies.
   The last strategy is to forget life-bloom. If you aren't using the glyph and T7 bonus combo for nourish, and rolling triple stacks makes you OOM, then just don't use life-bloom at all for tank healing, and just stick to using your other tools.
   Hopefully this information gives you what you want. Good luck!

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