There are perennial basils which come back year after year, like African Blue Basil (which has pretty blue veins on its leaves) and Thai Basil, while most other varieties are annuals, which you'll have to plant year after year.
1	There	there	PRON	EX	PronType=Dem	2	expl	2:expl	Discourse=joint-list_m:32->27:1
2	are	be	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
3	perennial	perennial	ADJ	JJ	Degree=Pos	4	amod	4:amod	Entity=(32-plant-new-cf5-2,11,12-coref
4	basils	basil	NOUN	NNS	Number=Plur	2	nsubj	2:nsubj|6:nsubj	_
5	which	which	PRON	WDT	PronType=Rel	6	nsubj	4:ref	Discourse=elaboration-attribute:33->32:0
6	come	come	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	acl:relcl	4:acl:relcl	_
7	back	back	ADV	RB	Degree=Pos	6	advmod	6:advmod	_
8	year	year	NOUN	NN	Number=Sing	6	obl:tmod	6:obl:tmod	Entity=(33-time-new-cf7-1-sgl)
9	after	after	ADP	IN	_	10	case	10:case	_
10	year	year	NOUN	NN	Number=Sing	6	obl	6:obl:after	Entity=(34-time-new-cf8-1-sgl)|SpaceAfter=No
11	,	,	PUNCT	,	_	15	punct	15:punct	_
12	like	like	ADP	IN	_	15	case	15:case	Discourse=elaboration-additional:34->32:1
13	African	African	PROPN	NNP	Number=Sing	15	compound	15:compound	Bridge=32<35|Entity=(35-plant-acc:inf-cf1-1,2,3-coref-African_blue_basil
14	Blue	Blue	PROPN	NNP	Number=Sing	15	compound	15:compound	_
15	Basil	Basil	PROPN	NNP	Number=Sing	10	nmod	10:nmod:like	Entity=35)
16	(	(	PUNCT	-LRB-	_	18	punct	18:punct	Discourse=elaboration-additional:35->34:0|SpaceAfter=No
17	which	which	PRON	WDT	PronType=Int	18	nsubj	18:nsubj	_
18	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	15	dep	15:dep	_
19	pretty	pretty	ADJ	JJ	Degree=Pos	21	amod	21:amod	Entity=(36-plant-new-cf6-3-sgl
20	blue	blue	ADJ	JJ	Degree=Pos	21	amod	21:amod	_
21	veins	vein	NOUN	NNS	Number=Plur	18	obj	18:obj	Entity=36)
22	on	on	ADP	IN	_	24	case	24:case	_
23	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	24	nmod:poss	24:nmod:poss	Entity=(35-plant-giv:act-cf1-1-ana-African_blue_basil)
24	leaves	leave	NOUN	NNS	Number=Plur	21	nmod	21:nmod:on	SpaceAfter=No
25	)	)	PUNCT	-RRB-	_	18	punct	18:punct	_
26	and	and	CCONJ	CC	_	28	cc	28:cc	Discourse=joint-list_m:36->34:1
27	Thai	Thai	PROPN	NNP	Number=Sing	28	compound	28:compound	Bridge=32<37|Entity=(37-plant-acc:inf-cf4-2-sgl-Thai_basil
28	Basil	basil	NOUN	NN	Number=Sing	15	conj	10:nmod:like|15:conj:and	Entity=37)32)|SpaceAfter=No
29	,	,	PUNCT	,	_	35	punct	35:punct	_
30	while	while	SCONJ	IN	_	35	mark	35:mark	Discourse=adversative-contrast_m:37->32:2
31	most	most	ADV	RBS	Degree=Sup	33	advmod	33:advmod	Entity=(38-plant-new-cf2-3-coref
32	other	other	ADJ	JJ	Degree=Pos	33	amod	33:amod	_
33	varieties	variety	NOUN	NNS	Number=Plur	35	nsubj	35:nsubj	Entity=38)
34	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	35	cop	35:cop	_
35	annuals	annual	NOUN	NNS	Number=Plur	6	advcl	6:advcl:while	Entity=(38-plant-giv:act-cf2-1-pred|SpaceAfter=No
36	,	,	PUNCT	,	_	40	punct	40:punct	_
37	which	which	PRON	WDT	PronType=Int	42	obj	42:obj	Discourse=elaboration-attribute:38->37:0
38-39	you'll	_	_	_	_	_	_	_	_
38	you	you	PRON	PRP	Case=Nom|Number=Sing|Person=2|PronType=Prs	40	nsubj	40:nsubj|42:nsubj:xsubj	Entity=(11-person-giv:inact-cf3-1-ana)
39	'll	will	AUX	MD	VerbForm=Fin	40	aux	40:aux	_
40	have	have	VERB	VB	VerbForm=Inf	35	acl:relcl	35:acl:relcl	_
41	to	to	PART	TO	_	42	mark	42:mark	_
42	plant	plant	VERB	VB	VerbForm=Inf	40	xcomp	40:xcomp	_
43	year	year	NOUN	NN	Number=Sing	42	obl:tmod	42:obl:tmod	Entity=(39-time-new-cf9-1-sgl)
44	after	after	ADP	IN	_	45	case	45:case	_
45	year	year	NOUN	NN	Number=Sing	43	nmod	43:nmod:after	Entity=(40-time-new-cf10-1-sgl)38)|SpaceAfter=No
46	.	.	PUNCT	.	_	2	punct	2:punct	_
