There's plenty of possibility for my assumptions to be wrong, but depending on when the -50% is applied, with some talent investiture the HT glyph is significantly more hps than plain Nourish. Assumptions: you've taken 2/5
Naturalist,
Tranquil Spirit, and
Empowered Touch; HT still gets 100% +heal; you have a HoT rolling for the 20% bonus to Nourish. Excuse my amateur usage of latex. p = spell power.
Nourish
 \cdot 1.2)
With 1000 spell power, Nourish averages 3470, 2313 hps, and ~6.4 hpm.
With 1500 spell power, Nourish averages 3984, 2656 hps, and ~7.4 hpm.
Rank 15 Healing Touch (-50% applied to base heal)
With 1000 spell power, a glyphed HT averages 5185, 3240 hps, and ~5.5 hpm.
With 1500 spell power, a glyphed HT averages 6560, 4100 hps, and ~7 hpm.
THis makes a glyphed HT significantly better hps at the cost of some minor mana efficiency. It scales extremely well (probably too well to be true).
Rank 15 Healing Touch (-50% applied last)

With 1000 spell power (2000 effective +heal), a glyphed HT averages 3785, 2365 hps, and ~4 hpm.
With 1500 spell power, a glyphed HT averages 4492, 2807 hps, and ~4.75 hpm.
This makes a glyphed HT still slightly better hps at the cost of mana efficiency. Probably not worth it compared to other glyph options.