гръста

By surface analysis, гръст (grǎst, “handful”) +‎ -а (-a) (dialectally, гръст could also refer to the plant).

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гръ́ста • (grǎ́sta) f

1. (dialectal) fibres, tuft, bundle of stems of a grassy plant (particularly hemp or flax)
2. (by generalization) hemp (herb of genus Cannabis)

   Synonym: коно́п (konóp)

3. (collective, figurative) lots, much, very

   гръ́ста пия́н ― grǎ́sta piján ― very drunk

• гръсте n (grǎste) — with collective suffix -ье (-je) < *-ьje

• гръ́стя (grǎ́stja, “to flay plant fibres”) (dialectal)

• “гръста”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• Nayden Gerov (1895) “гръ́ста и гръ́стѥ”, in Рѣчникъ на Блъгарскꙑй язꙑкъ. Съ тлъкувание рѣчи-тꙑ на Блъгарскꙑ и на Русскꙑ. [Dictionary of the Bulgarian language]‎ (in Bulgarian), volume 1, Plovdiv: Дружествена печꙗтница "Съгласие.", page 255